The VBA On Error statement is used for error handling. We can identify these errors by observing each step(By pressing ‘F8’) of a Macro running, with Local Window and Watch Widows.
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These types of errors generally occurs by missing the logic in the code designed. These errors are the most difficult to detect and fix, as there is no way that the VBA compiler can identify and 'point to' the error, in the way that it does for compile and runtime errors. However, the 'bug' may cause the macro to perform unexpected actions or return an incorrect result. Logical Errors, also known as 'bugs', occur during the execution of the VBA code, and allow the code to continue to run to completion. This type of VBA error is also generally easy to fix, as you will be given details of the nature of the error, and shown the location where the code has stopped running. Runtime errors occur during the execution of your code, and cause the code to stop running. If statement without corresponding End If statement , If a Compile Error is an incorrectly formatted line of VBA code, then the Vba Editor will immediately detect and highlight this, as soon as you attempt to move your cursor away from the specific line of code.Īlternatively, a compile error may be detected at the time you attempt to run your macro but before execution has started. If you type 'If' and forget the Then keyword.Ĭompile Errors are recognized by the VBA compiler as being illegal and they are highlighted as errors before your macro even starts to run. 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. The most common errors detected automatically by VBA system.
To understand error handling we must first understand the different types of errors in VBA. Mostly, the Error Handling technique is used to handle the Run time Errors.
If we think an error is likely to occur at some point during run time, it is good practice to write specific code to handle the error if it occurs and deal with it. These errors are normally caused by something outside your control like a missing file, database being unavailable, data being invalid etc. On Error GoTo Label to Handle Runtime Errors in VBA MacroĮrror Handling refers to the code that is written to handle errors which occur when your application is running.