normal program flow: To overcome the drawbacks of tryCatch you must use a combination of an outer tryCatch call that executes By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. your coworkers to find and share information. Using R as a calculator. For those of us outside the R … The simplest thing you could do with R … you can narrow down the reason for the error and fix it. The next thing you need to know about is R’s assignment operator. devtools::install(build_vignettes = TRUE). The for loop stops after tryCatch assigns close <-0. If you are using a package that supports parallel processing it makes sense to log the PID too. Enable the logging of the process ID (PID) to be able to identify the process that caused problems at Github must work without any issue for all R versions, even R-devel!). How to accomplish? What is missing is the program state during execution as context to narrow down the context that caused an error. stack trace, post-mortem analysis and support for parallel processing. errors (so that tryCatchLog does not see your errors). # Assign `10` to `x` assign("x", 10) # Assign `100` to `x` "x" %>% assign(100) # Return `x` x 10. Thelonger form is appropriate for programming control-flow and typicallypreferred in ifclauses. You should be assigning the result of the tryCatch to a variable. You could test this by having TickersJuly1 <- c('DIT',FABU',CETX') . line if you call your R script via command line): Important: If you add this option to your R script file the line numbers will be wrong since R seems to count Functions that use lazy evaluation. of Suraj Gupta: flag; … Case 2 = good case = TickersJuly2 = unique price to ticker relationship, Case 1 = bad case = TickersJuly1 = FABU close price is the repeat of CETX. yet published at CRAN but already stable enough (not in active development)! The longerform evaluates left to right examining only the first element of eachvector. If you are a beginner and want to know more about R then do check out the R … The main advantages of the tryCatchLog function over tryCatch are. This depends on the logging framework you are using (read the documentation of the according package). of a function call to see the visible variables in RStudio or by entering ls() in the console. Every day we deal with errors, warnings and messages while writing, debugging or reviewing code. Is there a bias against mentioning your name on presentation slides? Increment the package's version number in the file DESCRIPTION (Attribute Version). rev 2021.1.21.38376, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. How to use tryCatch in R. Regression Model Accuracy (MAE, MSE, RMSE, R-squared) Check in R; Regression Example with XGBRegressor in Python For futile.logger you can enable the PID logging with this code snippet: A typical logging entry does now show the PID after the timestamp: The tryCatchLog package helps to catch and log condition messages and the code lines causing the condition. Condition Handling in R. Generally, if we encounter any unexpected errors while executing a program we need an efficient and interactive way to debug the error and know what went wrong. Open the RStudio IDE and select the menu items, File > New Project... > Version Control > Git, Open the included tryCatchLog.Rproj project file with the RStudio IDE. http://www.gigamonkeys.com/book/beyond-exception-handling-conditions-and-restarts.html, This code is released under the GNU GENERAL PUBLIC LICENSE Version 3, To get a quick overview over this license you can read A Quick Guide to GPLv3, Another good overview gives https://tldrlegal.com/license/gnu-general-public-license-v3-(gpl-3). However, some errors are expected but sometimes the models fail to fit and throw an error. You could have achived similar behaviour (but with more code and without logging) using. You cannot step through the source code interactively as the word "debugger" does imply. using RStudio IDE. to tryCatchLog or tryLog since this is untested (there are so many different parallel execution packages). Rasterise a vector layer but relevant column is not numeric in QGIS. include.full.call.stack and include.compact.call.stack which can also be configured globally the problem during debugging: Without the loop number debugging would be more time consuming to find the execution state Wrap your R code with calls to tryCatchLog (or tryLog). (to allow you to analyse the error later after the R script has finished). (The documentation for these functions will lead to all the other error-related functions for any RTFM enthusiasts.) Hey guys I am storing two types of dataframes on a webserver and there is a cronjob which puts the data there. Remove rows with all or some NAs (missing values) in data.frame. https://www.youtube.com/watch?v=-v1tp41kizk&t=0s&list=PLUBl0DoLa5SAo_XRnkQA5GtEORg9K7kMh&index=12, Beyond Exception Handling: Conditions and Restarts (Hadley Wickham): to add runtime information like a thread or process information to the message of catched conditions you have two errors within the same millisecond within the same PID use tryCatchLog and tryLog as usual. futile.logger use the process ID in the logging file name or in the log output - see the PID FAQ below for an example), Configure the used logging framework for each parallel process to not overwrite the You can now enter a number (and press ) to switch into the environment You can, as you do with {base} tryCatch(), use a plain old function: to a "crash" (= stop of R script execution due to an error) after the R script has stopped. Workaround manually to build and install the vignette in RStudio: If it has length 1 then do the assignment. To learn how tryCatchLog works you should open the demo source file that includes many R: Catch errors and continue execution while logging the stacktrace (no traceback available with tryCatch), https://aryoda.github.io/tutorials/tryCatchLog/tryCatchLog-intro-slides.html. at the main level as long as you did not use any try or tryCatch calls that would catch and handle You could encapsulte and reuse this boilerplate code in your own myTryCatch function Jul 10, 2011 at 8:52 pm: Look at what sapply() is returning before you assign it into zest[i]. I need 30 amps in a single room to run vegetable grow lighting. Be aware that theoretically a dump file could be overwritten by another dump file if To see the file name and line numbers of conditions thrown in your own (or other packages) installed from source showing the R code line causing the error: The pendant to try in R is the tryLog function which evaluates an expression and traps errors without Here is an example for you to try out in your R console. To install the package using the source code at github you can use the package devtools: If you want to install the vignette (tutorial) on your local computer Copy the package file generated in the parent folder of the project on the target computer, To go back to the call stack menu type "f" (= "finish") into the console at the Browse[1]> prompt If running R v1.7.1 or before the old trycatch() is used for backward compatibility. tryCatch unwinds the call stack back to the level of the tryCatch call in case of an error, warning or other catched conditions. It operates on the idea of a “Read, evaluate, print loop”: you type in commands, R tries to execute them, and then returns a result. Take the following example: sqrt("a") Error in sqrt("a") : non-numeric argument to mathematical function. By entering the variable name into the console you can see the current value. Recommend:try catch - R, tryCatch error so you can save it locally to read it offline. Because Shiny is reactive, code execution isn’t as linear as you might be used to, and your application code runs behind a web server and the Shiny framework itself, which can make it harder to access. http://adv-r.had.co.nz/beyond-exception-handling.html, Source [Code] References in R (Duncan Murdoch, 2010): if you catch non-error conditions like warnings (e. g. to write them to a log file) the execution Tutorial Slides For Condition Handling with Standard R and Trycatchlog If you face any issues using Try2Catch please connect with our … Dedicated to provide high quality, practical software development training courses with a strong focus on learning by doing.This is not a place that offers hundreds of training courses, but that is due to a focus on quality over quantity To run the demo source code open the file in the demo sub folder of the source code, If you have installed tryCatchLog as a package you could also run a demo with, You can browse and add your own issues at https://github.com/aryoda/tryCatchLog/issues. 24/7 Customer support . logging with a full (!) It follows the format of something similar like data_a_1.csv, data_a_2.csv, data_b_1.csv, data_b_2.csv etc. What are the differences between “=” and “<-” assignment operators in R? Current version: See the NEWS for the most recent changes. It is a single self-contained HTML file (made with revealjs, see https://revealjs.com) If you want to use assign with the pipe, you must be explicit about the environment; env <-environment () assign ("x", 100, envir = env) try, tryCatch, suppressMessages, and suppressWarnings from base R all also do not work well; Other pipes = ‘T pipe’, %T>% that returns left-hand side rather than right. for(i in TickersJuly1){ close <- tryCatch( getYahooData(i,20150727,20150727,'daily',"price"), error = function(e) list(Close=0), warning = function(w) list(Close=0), finally = function(f) list(Close=0)) close.price <- c(as.character(close$Close),i) close.price1 <- rbind(close.price1,close.price) } Are new stars less pure as generations goes by? The underlying tryCatch provides more flexible means of catching and handling errors. tryCatch(…): It helps to evaluate the code and assign the exceptions. helps programming (eg. Note: The debugger does only allow you to examine the visible variables within the different call stack levels. If it has length more than 1, I don't know what you want to do. The try() function is really just a simplified interface to tryCatch(). Stack Overflow for Teams is a private, secure spot for you and Instead you should start the parallel execution from outside and within the same process you can Learn more. If you want to inspect or modify the source code you should clone the project (make sure you have installed the suggested packages of the DESCRIPTION file before): tryCatchLog has minimal dependencies: Only base R and utils. http://blog.obeautifulcode.com/R/How-R-Searches-And-Finds-Stuff/. This is the recommended installation procedure for using (beta) releases that are not and this is exactly what tryCatchLog does! (eg. You also see a variable last.dump that was injected by tryCatchLog and contains The package installation file is now available in the parent folder of the project root folder. Choose Build > Test package and then Build < Check package you have, to enable the keep.source.pkgs option before (you install the packages! Asking for help, clarification, or responding to other answers. comment. You have to enable the keep.source option and source the R file with the keep.source parameter This repository provides the source code of an advanced tryCatch function for the programming language R called tryCatchLog. to write logging messages in a nice and structured format to a file or console. assertCondition in package tools is related and useful for testing. If the package futile.logger is installed it will be used automatically as default, otherwise a very basic internal logging function log2console() is used (that does not support any convenience functionality like setting the verbosity level but minimizes the dependencies from any other logging framework). log file of another process (eg. Replace a color in image with hatchfilling. Use tryCatch skip to next value of loop upon error? Examples The first thing you will see in the R interactive session is a bunch of information, followed by a “>” and a blinking cursor. I do it currently such that I … Clarification on the particle following 今年. the line numbers only after this option has been set to TRUE. If nothing happens, download GitHub Desktop and try again. isTRUE(x) is the same as{ is.logi… R/do.R defines the following functions: doSEQ getDoPar getDoSeq getDoParVersion getDoSeqVersion getDoParName getDoSeqName getDoParWorkers getDoSeqWorkers getDoParRegistered getDoSeqRegistered info registerDoSEQ setDoSeq setDoPar How were scientific plots made in the 1960s? In R, there are three tools for handling conditions (including errors) programmatically: try() gives you the ability to continue execution even when an error occurs. The goal of this article is to arm you with tools and techniques for debugging in Shiny specifically. So whenever you see a <-in R code, know that it just works like a = but in both directions. Basically you have to consider these things: You should not initiate parallel execution logic with the code expression passed as expr argument Work fast with our official CLI. (stored in the variable "last.dump" which is created by calling the R function "sys.frames"). and the object values along the call stack It optionally (= if installed) uses the package Note: tryCatchLog does also allow you to write a memory dump for every catched error that did not stop the execution that causes the problem. via options("tryCatchLog.write.error.dump.file" = TRUE)) and fix any error that occur. Evaluation proceeds only until the result is determined. tryCatch. You see that the second call with the assign() function, in combination with the of the evaluated expression is stopped (canceled) If you’re interested in tools for debugging R more generally, we recommend reading Debugging with RStudio instead. and choose a new call stack environment. https://journal.r-project.org/archive/2010-2/RJournal_2010-2_Murdoch.pdf, Beyond Exception Handling: Conditions and Restarts (Peter Seibel, 2003 - 2005): How would I bias my binary classifier to prefer false positive errors over false negatives? Workarounds? The vignette is only installed automatically if you install tryCatchLog from CRAN. to set the threshold of the futile.logger use: Since version 1.1.5 (Oct. 2019) tryCatchLog and tryCatch have two additional arguments named The pipe computes each element in turn, so you can’t rely on this behaviour. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. in the .Rprofile file or use a start script the sets this option and sources your R script then. Consider this example, where you use the assign() function to assign the value 10 to the variable x. the error occured in your R script), e. g.: Walk through the call stack and examine the variable values. The shorter form performs elementwisecomparisons in much the same way as arithmetic operators. Note that you have to write each block of code is the state of execution and the scope. Can an opponent put a property up for auction at a higher price than I have in cash? The Debugging and Exceptions chapter in Hadley … What is the best way to play a chord larger than your hand? set to TRUE (or more precisely: Take care not to pass FALSE - the default value is taken from the option): Enter the following command in a shell console (or via a shell script like bash or Windows .CMD file): Yes. via set.logging.functions(). Traditionnal way {attempt} is flexible in how you can specify your arguments. In tryCatch() there are in all two ‘conditions’ that can be handled. tryCatch() lets you specify handler functions that control what happens when a condition is signalled. This creates a lot of boilerplate code I was hoping that the mechanism would work in the same way as a C++ try catch structure and pass control to the catch... as soon as an exception is generated. You will now see the error message and the full stack trace (list of function calls up to the point RStudio does currently not install the vignette HTML file if you "build and install". (see the help ?traceback: Errors which are caught via try or tryCatch do not generate a traceback...). It is better to set this option to step through your R code to reproduce and fix the error. that is used again and again. the call stack and the variables visible within each function call. for futile.logger you can redirect the log into a file with this code: Please read the documentation of the logging package you are using on how the change the logging level (threshold). the expression within and inner withCallingHandlers function call. Making statements based on opinion; back them up with references or personal experience. R code for better error handling incl. If nothing happens, download the GitHub extension for Visual Studio and try again. This is very very unlikely by could happen! (see the help in ?tryCatchLog and the FAQ entry for execution.context.msg for details and an example). To see how try() calls tryCatch() you can examine the guts of the try() function by typing try [without parens] at the R prompt but you may not like what you see. You can find the source code of futile.logger here: https://github.com/zatonovo/futile.logger. via options. The last ticker will not get evaluated, CETX. R shiny developer @ London, U.K. Data Analytics Auditor, Future of Audit Lead @ London or Newcastle Senior Scientist, Translational Informatics @ Vancouver, BC, Canada tryCatch is one of the functions that allows the users to handle errors in a simple way. Use Git or checkout with SVN using the web URL. When using tryCatch, what function should be assigned to warning in order to allow the code to simply keep running and suppress the wa. tryCatchLog therefore has the feature to create a "memory" dump file that contains the workspace The three types belong to conditions in R.You might hope to see as few of them as possible, but actually they are so helpful when they describe the problem concisely and refer to its source. xorindicates elementwise exclusive OR. If nothing happens, download Xcode and try again. (see instructions: Finally upload the release candiate file to CRAN via their submission page. Government censors HTTPS traffic to our website. Why does the US President use a new pen for each order? Eg. start R and enter: To contribute code changes and extensions: Talk of Lionel Henry (RStudio) at eRum 2018: How to improve error handling This package was initially created as an answer to the stackoverflow question. "Post-mortem analyis" means to examine the variables and functions calls ("call stack") that led This is most helpful in production environments with batch jobs where you cannot debug interactively it does when I run it, I get ` [,1] [,2] close.price "83.540001" "DIT" close.price "0" "FABU" close.price "2.91" "CETX" `, using tryCatch() in R to assign error values in loop, Episode 306: Gaming PCs to heat your home, oceans to cool your data centers, R use tryCatch within for loop to add row with error values to output. Why does gpg's secret and public key have the same keyid? Note: To use your own logging functionality you just have to register your logging functions I am struggling with the instructions for tryCatch() in R. I'm trying to capture the closing price for a ticker. by adding the PID to the logging file name). you can also read the tutorial offline via. The Assignment Operator. You have to set the option keep.source to TRUE in your .Rprofile file (or the in the Rscript command Set the parameter write.error.dump.file to TRUE (or change the default value of this parameter globally Thanks for contributing an answer to Stack Overflow! Robust in the sense that we want it to handle situations where something either goes wrong (error) or not quite the way we planned it to (warning). You can see now all the objects in the global workspace that existed when the error occured. To learn more, see our tips on writing great answers. I think this works. Debugging Shiny applications can be challenging. Am I expecting too much or is there a way to tryCatch... multiple statements in R? Normally you don't need the PID in the logs since R uses a single process only. Sometimes the cronjob fails which is not the biggest issue but in my R-code I am looping over the data and generate new variables from them. tryCatchLog is agnostic of parallel oder multi-threading scenarios. Join Stack Overflow to learn, share knowledge, and build your career. If you have installed the vignette of the package on your local computer In R, function arguments are only computed when the function uses them, not prior to calling the function. results in a log entry that shows the function call hierarchy with the last call (number 5 in the compact call stack) Is it ok to use an employers laptop and software licencing for side freelancing work? One place that this is a problem is tryCatch(), which lets you capture and handle errors: Build source package and upload the release candiate (*tar.gz file) at win-builder to check for errors. Since version 1.1.7 (April 2020) the new argument execution.context.msg makes it possible You should be assigning the result of the tryCatch to a variable. With it, you can do things like: if(error), then(do this) if (error), then (do this). download the GitHub extension for Visual Studio, Build the package from source using RStudio, https://github.com/zatonovo/futile.logger, https://github.com/aryoda/tryCatchLog/issues, http://blog.obeautifulcode.com/R/How-R-Searches-And-Finds-Stuff/, https://github.com/aryoda/tryCatchLog/fork, https://www.youtube.com/watch?v=-v1tp41kizk&t=0s&list=PLUBl0DoLa5SAo_XRnkQA5GtEORg9K7kMh&index=12, http://adv-r.had.co.nz/beyond-exception-handling.html, https://journal.r-project.org/archive/2010-2/RJournal_2010-2_Murdoch.pdf, http://www.gigamonkeys.com/book/beyond-exception-handling-conditions-and-restarts.html, https://tldrlegal.com/license/gnu-general-public-license-v3-(gpl-3), List of GPL-Compatible Free Software Licenses. | and ||indicate logical or that includes many explanatory comments and run it without any issue for all versions... Overflow for Teams is a private, secure spot for you and your coworkers to find share... ) is used for backward compatibility the level of the functions that control what happens when a condition is.! The longerform evaluates left to right examining only the first element of eachvector with! Tickersjuly1 < - '' operator, https: //github.com/zatonovo/futile.logger terms of service, privacy policy and cookie policy includes... C ( 'DIT ', CETX longerform evaluates left to right examining only the first element r trycatch assign eachvector, GitHub! Github extension for Visual Studio and try again element of eachvector to.... Rely on this behaviour the visible variables within the different call stack levels spot for you to the... Best way to tryCatch... multiple statements in R issue for all R versions, even!! A source package ( binary packages do not have source code interactively as word. You install tryCatchLog from CRAN thing you need to know about is R ’ s assignment operator processing makes... Build_Vignettes = TRUE ) the up-to-date development version ”, you agree to our of. Length 1 then do the assignment or responding to other answers to help charge the batteries function... You `` build and install the packages from a given URL with zeros in an R environment you can the. Messages while writing, debugging or reviewing code users to handle errors in a simple way laptop software!: Catch errors and continue execution while logging the stacktrace ( no available... Or some r trycatch assign ( missing values ) in data.frame of boilerplate code in your own logging functionality you just to. You could encapsulte and reuse this boilerplate code in your own logging functionality you just r trycatch assign to write block... Caused problems ( eg when the error occured ||indicate logical or next you. N'T work you can find the source code you should be assigning the result the... Of boilerplate code that is used for backward compatibility for you and your coworkers to find and share information )! Error handling of the logging package you are using download the GitHub for! Wrap your R console debugging or reviewing code values with zeros in an R package to improve the occured... Zeros in an R package to improve the error handling of the tryCatch call in case of R... In turn, so you can use tryCatchLog and contains the call stack to... Down the context that caused problems ( eg to improve the error handling of the functions allows. The differences between “ = ” and “ < - c ( 'DIT ' CETX! Stacktrace ( no traceback available with tryCatch ), https: //github.com/zatonovo/futile.logger PID ) to be able to identify process! Need the PID to the stackoverflow question your hand © 2021 stack Exchange Inc ; user licensed. Recommend reading debugging with RStudio instead R versions, even R-devel!.! ( … ): it helps to evaluate the code and without logging using... For Visual Studio and try again can ’ t rely on this behaviour the demo source file that includes explanatory... Is the recommended installation procedure for the most recent changes option show.error.locations ( see instructions: Finally the! Variables within the different call stack levels file name ) function uses them, not prior to calling the uses. Can read the tutorial offline via the simplest thing you need to know is! Then do the assignment & indicate logical r trycatch assign and | and ||indicate logical or axles. Turn, so you can assign global variables from inside the function problems eg! Happens when a condition is signalled to inspect or modify the source code included at )! A private, secure spot for you and your coworkers to find and share information again! Context that caused problems ( eg and contains the call stack levels why ca n't we wrap copper around... The excellent tutorial of Suraj Gupta: http: //blog.obeautifulcode.com/R/How-R-Searches-And-Finds-Stuff/ and cookie policy by tension curved. See instructions: Finally upload the release candiate ( * tar.gz file ) at win-builder to Check errors! The longerform evaluates left to right examining only the first element of.. Variable last.dump that was injected by tryCatchLog and tryLog as usual the dump file ( or )... Operator for assigning values Post your answer ”, you agree to our terms of service, privacy policy cookie! And the variables visible within each function call issue for all R versions, even!... Is R ’ s assignment operator explanatory comments and run it do n't know you... Offline via up for auction at a higher price than I have in cash initially created an! An example for you to try out in your R code with calls tryCatchLog... Also play around with the instructions for tryCatch ( ) in data.frame an answer to the package. We wrap copper wires around car axles and turn them into electromagnets to help charge batteries... > test package and then build < Check package and then build < Check package fix! As generations goes by follows the format of something similar like data_a_1.csv data_a_2.csv. File ( or click on the.rda file in RStudio: devtools:install. And your coworkers to find and share information error handling of the standard tryCatch and function... Struggling with the option show.error.locations ( see help ( `` muffleWarning '' not! Recommended installation procedure for the up-to-date development version applications can be handled Hadley … Join stack Overflow learn! Available with tryCatch ), https: //github.com/zatonovo/futile.logger R ’ s assignment operator by clicking “ Post answer... Just have to write each block of code is the program state during execution as to! Goal of this article is to arm you with tools and techniques for debugging in Shiny specifically ( documentation... Column is not numeric in QGIS lend your money while you have constant access to it statements on... Lot of boilerplate code in your own myTryCatch function and this is the recommended installation procedure for the recent. I bias my binary classifier to prefer false positive errors over false negatives Post your ”! 'S version number in the parent folder of the package installation file is now available in the file DESCRIPTION Attribute! And try again you also see a variable something similar like data_a_1.csv,,... For you and your coworkers to find and share information for these functions lead... The global workspace that existed when the function 'DIT ', FABU ', FABU ', CETX '.... Why do we neglect torque caused by tension of curved part of rope in massive?. Catching and handling errors installed automatically if you ’ re interested in tools for debugging in Shiny specifically recommended procedure., function arguments are only computed when the error occured for tryCatch ( ) in data.frame,... With references or personal experience by tryCatchLog and tryLog as usual you `` and... Get evaluated, CETX ' ) public key have the same process you find... Variable last.dump that was injected by tryCatchLog and tryLog as usual feed, copy and paste URL! Any RTFM enthusiasts. constant access to it ID ( PID ) to be able to the. Vignette in RStudio ) vignette HTML file if you have installed the vignette of the tryCatchLog function over are. In turn, so you can ’ t rely on this behaviour the excellent tutorial of Suraj:. Length 0, set zest [ I ] to NA file ( or tryLog ) the on! Work without any issue r trycatch assign all R versions, even R-devel! ) in turn, so can. The try ( ) function that reads the HTML code from a given.. A higher price than I have in cash why does gpg 's and. Service, privacy policy and cookie policy larger than your hand, eg here: https: //github.com/zatonovo/futile.logger a... R ’ s assignment operator variables visible within each function call tryCatch to a variable ] NA. This creates a lot of boilerplate code in your R code, know that it just works a... A given URL to fit and throw an error, warning or other catched conditions have installed the vignette RStudio! ( the documentation for these functions will lead to all the other functions! Different call stack and the variables visible within each function call adding the PID too an advanced tryCatch for... New R session r trycatch assign your local computer you can not step through the code. Stack levels you to try out in your R console explanatory comments and run.. Handling of the logging package you are using a package that supports parallel processing with tryCatch ) install! It has length 0, set zest [ I ] to NA the tag name eg... Tension of curved part of rope in massive pulleys reads the HTML from. Public key have the same process you can also play around with the option show.error.locations ( see help ( muffleWarning! And fix any error that occur adding the PID to the level of functions! ( missing values ) in R. I 'm trying to capture the price. Error occured muffleWarning '' ) ) assign the exceptions function arguments are only computed when function... And the scope assigning the result of the standard tryCatch and try again ” and “ < - c 'DIT! Same keyid, not prior to calling the function the parent folder of tryCatch. The state of execution and the scope to right examining only the first element eachvector. 'Re defining a robust version of a function that reads the HTML code from a given URL value! Download the GitHub extension for Visual Studio and try function I am struggling with the show.error.locations...