On Error GoTo LineLabel

This statement lets you provide a custom error handler.

The LineLabel must be in the same procedure as the On Error statement.
You should always put this LineLabel at the end of the subroutine.
This section of code between the LineLabel and the End Sub is often referred to as the Error Handling Routine.
You should always include an Exit Sub, Exit Function or Exit Property before your error handling routine to ensure that it is only executed when an error occurs.

On Error GoTo ErrorHandler

You should always use a consistent line label for your error handling.