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Other examples when a run-time error can occur are: on using incorrect variable names or variable types; if your code goes into an infinite loop; using a value or reference outside the allowable range; and so on. If you dont implement error handling in your macro, on encountering a run-time error your code will stop execution and go into Break Mode and display an error message, thereby confusing and frustrating the user.
It is important to set error handling in every procedure else your macro might just crash or stop executing on encountering a run-time error and vba will display a default error message and go into Break Mode allowing the user to debug your code. Basic Error Handling hides the fault in the macro when it crashes and exits gracefully, and informs the users accordingly.
Advanced Error Handling techniques involve saving information on the error cause and the point of the error, and attempt to resolve the error and provide information to the user on the next step. At a basic level, Error Handling involves two parts - i enables an error-handling routine with an On Error Statement on encountering an error, and ii an error-handling routine which is the section where the procedure flow is directed to on encountering an error.
It is to be noted that an error-handling routine is not a procedure Sub or Function but a section of code marked by a line label or a line number. An On Error statement enables or disables an error-handling routine within a procedure. You can determine how errors are handled in VBE, by selecting the appropriate option. In the Error Trapping Section, you can select from 3 options. Break on All Errors : Selecting this will stop your code execution and enter Break Mode on every error, even if you are using an error handler including the On Error Resume Next statement , hence it is not advised to select this option.
Break on Unhandled Errors : This works well in that an error is trapped when an error handler is active else the error causes the macro to go into Break Mode, except for debugging class modules wherein on encountering an error the debugger stops on the line which calls the class and not on the actual error line in the class, thus making it difficult to spot the error and fixing it.
Break in Class Module : Selecting this option will cause an unhandled error in a class module to stop code execution and go into Break Mode at the actual error causing line of code in that class module, but does not work if you use raise errors in your classes via the Err. An error handler determines what action is to be taken within a procedure, on the occurrence of an error.
An 'enabled' error handler is the one which is enabled by the On Error Statement; an 'active' error handler is the 'enabled' error handler which is in the process of handling an error. On encountering an error you may decide to exit the procedure, or else you may want to rectify the error and resume execution. For this you will use On Error statements or Resume statements. A Resume statement can only be used in an error-handling routine - it resumes execution after the error-handline routine finishes.
If an error-handling routine is enabled, procedure flow is directed to the error-handling routine which handles the error. On Error GoTo line. The On Error GoTo line Statement enables the error-handling routine, which is the section starting at the line specified in the line argument.
The line argument is required to be specified, and it can be any line label or line number in the same procedure as the On Error statement. A compile-time error will occur if the specified line argument is not in the same procedure as as the On Error statement.
The On Error GoTo statement traps all errors, without exceptions. On Error Resume Next. This Statement specifies that on the occurrence of a run-time error, the procedure flow is directed to the next statement which follows the statement where the error occurred.
This effectively skips the error and continues with the macro execution. An On Error Resume Next statement becomes inactive on calling another procedure is called, hence it needs to be specified in every procedure that is called to use this error handling therein.
Note that the properties of the Error object Err Object get cleared automatically when Resume Next is used in an error-handling routine, but not on using the Resume Next statement otherwise. On Error GoTo 0. On Error GoTo 0 statement Disables any enabled error handler in the current procedure - it means as having no error handler in the code.
This statement does not specify 0 as the start of the error-handling routine even though a line numbered 0 may be present in the procedure. An error handler is automatically disabled when a procedure is exited or if it has has run completely, if the procedure does not have an On Error GoTo 0 statement. For a procedure containing an error-handling routine, you will also need to include an exit routine within the procedure to ensure that the error-handling routine runs only if an error is encountered.
This can be done by placing an Exit Sub, Exit Function or Exit Property statement immediately above the error-handling routine, if you don't want it to execute when there is no error. Single Exit Point. It may be preferable, not necessary, to have a single exit point in your procedure, so that after the Error Handler has handled the error, the procedure flow is directed to a point within the procedure so that the procedure exit is the same under all circumstances.
This Label has no effect on code execution if no error has occurred. It is preferable to have a single exit point because usually some type of clean up is required before the procedure exits, ex. A single exit point will obviate the need to duplicate this clean up code in the error-handling routine.
Using a Resume Statement. You can aslo exit or end the procedure after the error-handling routine finishes and not necessarily use the Resume statement. We discuss below three types of syntax used for the Resume statement, and how the control transfers ie. Resume or Resume 0 : Where the error occurrs in the same procedure as the error handler, control is returned to the statement that caused the error and execution resumes at this line.
Where the error occurrs in a called procedure, control is returned to the last calling statement in the procedure containing the error handler. Resume Next : Where the error occurrs in the same procedure as the error handler, control is returned to the next statement which follows the statement that caused the error and execution resumes at this line. Where the error occurrs in a called procedure, control is returned to the next statement which follows the last calling statement in the procedure containing the error handler.
Resume line : When an error occurrs in a procedure, control transfers to the line specified in the line argument. The line argument is a line label or line number and should be in the same procedure as the error handler. Which Resume Statement to use:.
The Resume or Resume 0 statement is used when it is necessary for the macro to correct the error and re-execute the corrected code - say when the user enters an invalid value and you want to prompt the user to enter a valid value and resume at the same line and re-excecute. The Resume Next statement is used when the error handler corrects the error and it is not required to re-execute the error code but to continue execution at the next line.
The Resume line statement is used when you want to continue execution at another point in the procedure, which could also be an exit routine. Example Exit Sub. End If. GoTo WsName. MsgBox Err. End Sub. Sub OnErrorGoToSt 'using an On Error GoTo Statement in a procedure for handling errors, and a Resume statement within an error-handling routine 'a run-time error occurs while naming another sheet with the same name.
MsgBox "Name already exists". Resume WsName. Error Handling in a Called Procedure. If the called procedure in which an error has occurred does not have an error handler , VBA searches backward in the calling procedures for an enabled error handler, and if found the control is transferred to that error handler in the calling procedure. If an enabled error handler is not found in the backward search, then execution will stop in the current procedure displaying an error message.
Example 3: Error in Nested Procedures - in the absence of an error handler in the called procedure in which an error has occurred, VBA searches backward in the calling procedures and control is transferred to an enabled error handler, if present, in the calling procedure.
Input Box is re-generated for making a valid entry. M, which generates the Input Boxes afresh. Resume M. Resume TM. Resume Next. End Function. If an error occurs in a called procedure within an active error handler which does not correct for that error , using the Raise method to regenerate the original error will force Visual Basic to search backward through the calling procedures hierarchy for an enabled error handler.
The Err object's Raise method is useful to regenerate an original error in a vba procedure - refer the section on Error Object for details on the Raise Method. This is useful in cases where the called procedure's error handler is not equipped to correct the error either because this type of error was not expected to occur in the called procedure or for any other reason. In this scenario the sequence will be that an error occurrs in a called procedure - the called procedure has an enabled error handler which does not correct the error, and the original error is regenerated using the Raise Method - Visual Basic is forced to do a backward search and execution flows to the error handler if present of the immediately preceding calling procedure, which may or may not correct the error - if the immediately preceding calling procedure does not have an error handler or its error handler is not capable of correcting the error and the error is regenerated then the backward search continues.
If you do not regenerate the error in the called procedure whose enabled error handler is incapable of handling the error, the error may cause the macro to stop or continue with the error causing other errors. Example 4: Error in Nested Procedures - for an error in a called procedure with an active error handler which does not correct for that error, on Regenerating the error with the Raise Method, VBA searches backward in the calling procedures and control is transferred to an enabled error handler, if present, in the calling procedure.
ChDir strFilePath. MsgBox "File Copied". MsgBox "Error is other than error no. Raise intOrigErrNum. The Number Property Err. Number returns a numeric value specifying the error with a value of zero meaning no error - this is the error's number. The Number Property is the default property of the Err object. The Description Property Err. Description returns a short description of the error but this may not exist at times - if no Visual Basic error corresponds to the Number property, the "Application-defined or object-defined error" message is used.
The Description property returns a zero-length string "" if no run-time error has occurred or ErrorNumber is 0. The property settings of the Err object relate to the most recent run-time error, so it is important that your error-handling routine saves these values before the occurrence of another error.
What color should it be if there is an error in the cell? On Error Resume Next simply swallows errors. You need to figure out how to avoid the error to begin with. On another note, it seems you could accomplish this with Conditional Formatting. You also might want to read through some of these questions.
Add a comment. Active Oldest Votes. Cells rw, 1 Then. Cells rw, 1. Value2 Then. Improve this answer. I am using this solution to help my error catching code if a Vlookup cant find anything and I get the error "Expected Array". Cells row, col format? If you are using worksheetfunction. The IsError or a variant will catch no match errors. I am using the Vlookup within the spreadsheet.
The VBA code pastes the lookup value into a cell, then stores all the return values as variables as well. I did it this way to avoid looping through 60, lines looking for the lookup value. This may be too involved to be resolved in comments.
Please post a new question with all the details. It depends on what you want to do. On Error Resume Next will ignore the fact that the error occurred. This is a great way to get your code to execute to completion, but will just about guarantee that it won't do what you want. On Error Goto 0 is the default response. FreeMan FreeMan 5, 1 1 gold badge 26 26 silver badges 49 49 bronze badges.
Clear End Select End Sub. As Freeman said a few seconds before I posted - and Chip Pearsons site is probably where I got the above code from in the first place all those years ago. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.
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When you type a line and press return, VBA will evaluate the syntax and if it is not correct it will display an error message. For example if you type If and forget the Then keyword, VBA will display the following error message. The line will still appear red if there is an error but the dialog will not appear. Compilation errors occur over more than one line. The syntax is correct on a single line but is incorrect when all the project code is taken into account.
The following screenshot shows a compilation error that occurs when a For loop has no matching Next statement. This means your application has no compilation errors at the current time. This ensures that your code has no compilation errors when you run it. These should not be confused with Runtime errors. Runtime errors occur when your application is running. They are normally outside of your control but can be caused by errors in your code.
For example, imagine your application reads from an external workbook. If this file gets deleted then VBA will display an error when your code tries to open it. When we think a runtime error could occur we put code in place to handle it. For example, we would normally put code in place to deal with a file not being found.
The following code checks if the file exists before it tries to open it. If the file does not exist then a user friendly message is displayed and the code exits the sub. When we think an error is likely to occur at some point, it is good practice to add code to handle the situation. We normally refer to these errors as expected errors. We use the VBA error handling statements to handle the unexpected errors.
Before we look at the VBA Handling there is one type of error we must mention. Some runtime errors are not considered errors by VBA but only by the user. Let me explain this with an example. Imagine you have an application that requires you to add the values in the variables a and b.
This is not a VBA error. Your code syntax is perfectly legal. However, from your requirements point of view it is an error. You can deal with these errors using Unit Testing and Assertions. This statement performs some action when an error occurs during runtime. This is the default behavior of VBA. When an error occurs, VBA stops on the line with the error and displays the error message. The application requires user intervention with the code before it can continue.
This could be fixing the error or restarting the application. In this scenario no error handling takes place. The second assignment line results in a divide by zero error. When we run this code we will get the error message shown in the screenshot below. If you select End then the application simply stops.
If you select Debug the application stops on the error line as the screenshot below shows. This behaviour is fine when you are writing VBA code as it shows you the exact line with the error. This behavior is unsuitable for an application that you are given to a user. These errors look unprofessional and they make the application look unstable. An error like this is essentially the application crashing. The user cannot continue on without restarting the application.
They may not use it at all until you fix the error for them. By using On Error GoTo [label] we can give the user a more controlled error message. It also prevents the application stopping. We can get the application to perform in a predefined manner. It is not a good idea to do this.
If you ignore the error, then the behavior can be unpredictable. The error can affect the application in multiple ways. You could end up with invalid data. In this code we are checking to see if Microsoft Outlook is available on a computer. All we want to know is if it is available or not. We are not interested in the specific error. In the code above, we continue on if there is an error. Then in the next line we check the value of the Outlook variable.
If there has been an error then the value of this variable will be set to Nothing. This is an example of when Resume could be useful. The point is that even though we use Resume we are still checking for the error. The vast majority of the time you will not need to use Resume. It is the equivalent of the Try and Catch functionality you see in languages such as C and Java.
When an error occurs you send the error to a specific label. It is normally at the bottom of the sub. If not you will get a compilation error. Note 2: When an error occurs when using On Error GoTo [label] , the error handling returns to the default behaviour i. The code will stop on the line with the error and display the error message. See the next section for more information about this.
This statement is different than the other three. It is used to clear the current error rather than setting a particular behaviour. When an error occurs using On Error GoTo [label] , the error handling behaviour returns to the default behaviour i. That means that if another error occurs the code will stop on the current line. This behaviour only applies to the current sub. Once we exit the sub, the error will be cleared automatically.
Take a look at the code below. The first error will cause the code to jump to the eh label. The second error will stop on the line with the error. This has no effect as the error has not been cleared. In other words the code will stop on the line with the error and display the message.
To clear the error we use On Error GoTo Think of it like setting a mouse trap. When the trap goes off you need to set it again. In most cases using Resume Next is better as it clears the error and resumes the code at the next line after the error occurs. Note 2: The Err Object has a member Clear. VBA will always be set to one of these behaviors. When you use On Error , VBA will change to the behaviour you specify and forget about any previous behavior.
The Resume Next statement is used to clear the error and then resume the code from the line after where the error occurred. If your code can have multiple errors and you want to keep detecting them then this line is very useful. We could use On Error Goto -1 to clear the code and then use a goto statement to go back to the code like this:.
The Resume Next provides a nicer way of doing it and it always means the code is much clearer and easier to understand:. When an runtime error occurs, VBA automatically fills the Err object with details. The Err. Description provides details of the error that occurs. This is the text you normally see when an error occurs e.
Number is the ID number of the error e. The only time you really need this is if you are checking that a specific error occurred and this is only necessary on rare occasions. Source property seems like a great idea but it does not work for a VBA error. The source will return the project name, which hardly narrows down where the error occurred. However, if you create an error using Err. Raise you can set the source yourself and this can be very useful. This is because there are no line numbers present.
Adding line numbers to your code manually is cumbersome. However there are tools available that will allow you to easily add and remove line numbers to a sub. When you are finished working on a project and hand it over to the user it can be useful to add line numbers at this point. If you use the error handling strategy in the last section of this post , then VBA will report the line where the error occurred.
Raise allows us to create errors. We can use it to create custom errors for our application which is very useful. Imagine we want to ensure that a cell has an entry that has a length of 5 characters. We could have a specific message for this. When we create an error using Err. Raise we need to give it a number. We can use any number from to for our error. We must use vbObjectError with the number e. Clear is used to clear the text and numbers from the Err. In other words, it clears the description and number.
It is rare that you will need to use Err. In the code below we are counting the number of errors that will occur. To keep it simple we are generating an error for each odd number. We check the error number each time we go through the loop.
If the number does not equal zero then an error has occurred. Once we count the error we need to set the error number back to zero so it is ready to check for the next error. Note 1: Err. Clear resets the text and numbers in the error object but it does not clear the error — see Resume Next Or On Error GoTo -1 for more information about clearing the actual error. Logging means writing information from your application when it is running. When an error occurs you can write the details to a text file so you have a record of the error.
The log is not only for recording errors. You can record other information as the application runs. When an error occurs you can then check the sequence of events before an error occurred. Below is an example of logging. How you implement logging really depends on the nature of the application and how useful it will be:. Having a lot of information when dealing with an error can be very useful.
Often the user may not give you accurate information about the error that occurred. By looking at the log you can get more accurate information about the information. These items are considered obsolete but I have included them as they may exist in legacy code. The Error Function is used to print the error description from a given error number. It is included in VBA for backward compatibility and is not needed because you can use the Err.
Description instead. The Error statement allows you to simulate an error. It is included in VBA for backward compatibility. You should use Err. Raise instead. With all the different options you may be confused about how to use error handling in VBA. The above strategy has one major drawback. It is better than having no strategy as it prevents the application crashing. But that is the only real benefit.
Source with anything useful so we have to do this ourselves. In this section, I am going to introduce a more complete error strategy. I have written two subs that perform all the heavy lifting so all you have to do is add them to your project. The following diagram shows a simple visual of what happens when an error occurs in Sub3.
The only messy part to this is formatting the strings correctly. I have written two subs that handle this, so it is taken care of for you. A well-written macro is one that includes proper exception handling routines to catch and tackle every possible error. Even if any fatal unexpected error occurs in the code then also you should ensure that the code should terminate gracefully. This is also called VBA default exception handling. When On Error Goto 0 is in effect, it is the same as having no error handler in the code.
Continue : This will ignore the exception and continue the code, only if it is possible to do so. Debug: This option will bring the program control back to the statement from where the exception has occurred. This helps you to debug the code. It is the second form of the On Error statement. This statement tells the VBA program to ignore the error and resume the execution with the next line of code.
However, it is the sole responsibility of the programmer to make sure that any handled error should not have any side effects like uninitialized variables or null objects on the program execution. This can be ensured by using the VBA Err object. Err object in VBA comes into the picture whenever any runtime error occurs.
The Err object preserves information about one exception at a time. When an exception occurs, the Err object is updated to include information about that exception. Now as you can clearly see, that in this macro Line 3 causes an exception. But as we are using the On Error Resume Next statement so this line will be skipped and the control will flow to the next statement.
Now, here in this code, we are checking the Err.