IsError VBA Function: Has a Custom Function Produced an Error?
The Excel IsError function is used to determine if a custom function has produced an error. The custom function
is already pre-defined in a module and you would insert it within the IsError parenthesis.
IsError Example:
Dim FindError As Boolean
FindError = (CustomFunction())
'Your custom function is executed and if the results produce an error, FindError will equal False
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