A formula in a cell (Cell:B7) could not be converted because it
contains a function that is not available in the file format to which
you are saving. If you continue the save, the formula and result will
be saved, but the function itself will be converted to an error value.
Microsoft Excel cannot convert some of the cells. The total number of
errors found is 3.
Filename may contain features that are not compatible with File format. Do you want to keep the workbook in this format?
If you choose to save the file following these error messages, then when you reopen the file, Excel will convert the formula in the cells referenced to:
=#N/A