Help with Unable to set the OnAction property of the Button class error

I'm trying to debug a macro that was written by someone else who is no longer with my company. My VBA skills are "ok", but I'm running into a problem.

The section of code where I'm running into the error is:

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I get the error at

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calc is a variable representing a specific sheet within the workbook
master_wb_name is set as a string equal to ActiveWorkbook.Name
Rev_Rec_Cal_Button2 is a call to another sub within the workbook

This workbook is hosted on a sharing site within my organization. Usually it runs just fine. Where the error comes in is when someone downloads the file even though they already have a version in their download folder. This changes the name of the workbook to "Workbook Name (1)", or "Workbook Name (2)", etc.

Is there a way to solve for this error without trying to explain to the folks that download the file that they already have a version downloaded?

Yes, same workbook. Also, the sub with the code that gets the error is in the same module as Rev_Rec_Cal_Button2.

Ah, so simple. That seems to do it. Thank you!