Describes the cause and action for error messages.
Error Message(English)：
group outline does not work
https://www.youtube.com/watch?v=zYybjWrZZHQ
Outline (group) data in a worksheet - Excel - Office Support - Office 365
https://support.office.com/en-ie/article/outline-group-data-in-a-worksheet-08ce98c4-0063-4d42-8ac7-8・・・
Excel: Group rows automatically or manually, collapse and expand rows
https://www.ablebits.com/office-addins-blog/2017/12/28/excel-group-rows/
How to Group Rows and Cells in Excel - and Outline them too
https://spreadsheeto.com/grouping-outlining/
How to Group and Outline Excel Data: 14 Steps (with Pictures)
https://www.wikihow.com/Group-and-Outline-Excel-Data
How to get excel to auto-outline hierarchy into groups? - Super User
https://superuser.com/questions/748213/how-to-get-excel-to-auto-outline-hierarchy-into-groups
How to group rows and columns in Excel | OXEN Technology
https://oxen.tech/blog/grouping-excel/
Working with Outlines and Grouping ? XlsxWriter Documentation
https://xlsxwriter.readthedocs.io/working_with_outlines.html
How To Change Excel's Group Outline Direction Settings ? The ...
https://www.thespreadsheetguru.com/blog/change-excels-group-outline-direction-settings