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[email protected] cameronhudson8@gmail.com is offline
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Default The name ... either conflicts with a valid range reference or isinvalid for Excel.

I saved as an XLSX file a document that had been an XLS file. This message appears when I open the new XLSX file, and occasionally appears spontaneously while the file is open (or for an unknown reason, at least).

It's funny because Excel suggested that I save the file as XLSX to improve compatibility.