Describes the cause and action for error messages.
Error Message(English)：
is not calculating sum
Excel formulas not working: how to fix formulas not updating or not ...
https://www.ablebits.com/office-addins-blog/2016/02/03/excel-formulas-not-working/
5 Reasons Why your Excel Formula is Not Calculating - YouTube
https://www.youtube.com/watch?v=AvR1EtjToLk
https://www.youtube.com/watch?v=AvR1EtjToLk
How to Fix Excel Numbers That Don't Add Up - YouTube
https://www.youtube.com/watch?v=h8543MwnnTs
https://www.youtube.com/watch?v=h8543MwnnTs
worksheet function - Excel isn't calculating the SUM of cells ...
https://superuser.com/questions/309181/excel-isnt-calculating-the-sum-of-cells
Sum returning 0 in Excel
https://superuser.com/questions/1106852/sum-returning-0-in-excel
microsoft excel - Cells show formula, not formula ...
https://superuser.com/questions/811265/cells-show-formula-not-formula-result
microsoft excel - Status bar quick sum not working
https://superuser.com/questions/447999/status-bar-quick-sum-not-working