Describes the cause and action for error messages.
Error Message(English)：
invalid cell characters
How to limit characters length in a cell in Excel? - ExtendOffice
https://www.extendoffice.com/documents/excel/952-excel-cell-character-limit.html
Identify invalid characters in text based cell - Stack Overflow
https://stackoverflow.com/questions/262537/identify-invalid-characters-in-text-based-cell
Replace character in excel cell
https://stackoverflow.com/questions/55485464/replace-character-in-excel-cell
Excel - Counting letters and numbers separately in a single cell ...
https://stackoverflow.com/questions/12186510/excel-counting-letters-and-numbers-separately-in-a-sing・・・
Check if cell contains Non-Alpha characters in Excel
https://stackoverflow.com/questions/29855647/check-if-cell-contains-non-alpha-characters-in-excel
Excel file contains invalid hidden characters that can't be ...
https://stackoverflow.com/questions/29391341/excel-file-contains-invalid-hidden-characters-that-cant・・・
Excel formula: Remove unwanted characters | Exceljet
https://exceljet.net/formula/remove-unwanted-characters
validation - How to validate for a set of characters in Excel ...
https://superuser.com/questions/348456/how-to-validate-for-a-set-of-characters-in-excel
worksheet function - Excel wont delete content ...
https://superuser.com/questions/1118036/excel-wont-delete-content-from-a-cell