Describes the cause and action for error messages.
Error Message(English)：
columns missing not hidden
Can't See Columns in Excel | Chron.com
https://smallbusiness.chron.com/cant-see-columns-excel-71514.html
Displaying a Hidden First Column (Microsoft Excel) - Excel Tips
https://excel.tips.net/T002626_Displaying_a_Hidden_First_Column.html
Unhide the first column or row in a worksheet - Excel
https://support.office.com/en-us/article/unhide-the-first-column-or-row-in-a-worksheet-d6b47608-80ee・・・
When unhide row doesn't work… | wmfexcel
https://wmfexcel.com/2014/04/01/when-unhide-row-doesnt-work/
MS Excel 2016: Unhide column A - TechOnTheNet
https://www.techonthenet.com/excel/columns/unhide_cola2016.php
Recover Hidden Column A.mp4 - YouTube
https://www.youtube.com/watch?v=R3oLt9qXgHc
https://www.youtube.com/watch?v=R3oLt9qXgHc
Why is the Pivot Table Field List Missing & How to Get It Back - YouTube
https://www.youtube.com/watch?v=hDLyVupOvcs
https://www.youtube.com/watch?v=hDLyVupOvcs