Trouble with "Excel 4.0 function stored in defined names" error

I'm stuck. I have a macro that takes a single sheet, creates a copy, and sets up an Outlook email window to enter an email address and send. I get the error "Excel 4.0 function stored in defined names". I run this same code on another sheet in my workbook and it works perfect. My code is below.

The error references the line:

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The full code is:

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Any suggestions?