SI Add-in function - ExtendFormulaeToUsedRows

Hi all,


I have a question on the ExtendFormulaeToUsedRows.


After I added this Add-in function, it always prompt an error message stating ....[Select method of Worksheet class failed]........

The worksheet is the first worksheet named Sheet1 which is exactly the the name I entered into Destination sheet.


Does anyone know why is that? I seem to get this error a lot.


Thanks,

Keen