Minor loss of fidelity & Significant loss of functionality

[Jesling]

Hey guys, I have no idea what's wrong with my excel file, the formula did not work at all, and then it show me the this when I would like to close the file. You may refer to the pictures attached below

Significant loss of functionalityMinor loss of fidelity

P/s: File type is in xls.

Anyone knows how to solve this? 

Thank you. 

[#2]

@Jesling Why are you saving to an xls file-type? That's old. Just use today's standard and save as an Excel Workbook, which has a file extension of xlsx. 

[#3]

I think the report is very clear. Everything is there, even links for further information and how to fix.