Describes the cause and action for error messages.
Error Message(English)：
why autosum excel not working
https://www.youtube.com/watch?v=h8543MwnnTs
5 Reasons Why your Excel Formula is Not Calculating - YouTube
https://www.youtube.com/watch?v=AvR1EtjToLk
https://www.youtube.com/watch?v=AvR1EtjToLk
Excel 2016 ? Auto-sum not working until edit formula or save ...
https://www.itsupportguides.com/knowledge-base/office-2016/excel-2016-auto-sum-not-working-until-edi・・・
Excel Tip of the Week #53 - Causes of formulas not calculating - Blogs ...
https://ion.icaew.com/itcounts/b/weblog/posts/exceltipoftheweek53causesofformulasnotcalculating
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
alt + = not working in Excel 2010 on my HP laptop
https://superuser.com/questions/1032381/alt-not-working-in-excel-2010-on-my-hp-laptop
Autosum in excel 2010 STILL NOT WORKING?
https://superuser.com/questions/775446/autosum-in-excel-2010-still-not-working