Excel has been detected illegible content error


I have been searching on the internet this error about excel.

"Excel found unreadable content in filename.xls. Do you want to recover the contents of this workbook? If you trust the source of this workbook, click Yes."

When I go to Microsoft Support website, I saw this solution


In this page it says "To resolve this issue, remove the expressions from all Current Time Member and weight on the KPI properties." I did not understand what to do exactly. Please help me

Click yes, save under a new filename, and check the contents match what you expect. If you're able to restore using "Restore previous versions" (right click on the file in explorer) then that's an option as well.