Error of mismatch columns

[Ksenia1]

Dear community,

I am dealing with the following error message:

Unable to add/edit/delete row in table ‘Form’. → Error: There is a mismatch in the number of columns between the spreadsheet for Gespräch Form and the table schema. The table has 87 columns but the schema has 86 columns. Please regenerate the table column structure. Error: Data table ‘Mitarbeiterentwicklung-1560327:3.000020:Gespräch Form’ is not available Error: Data table ‘Gespräch Form’ is either inaccessible or empty.

I already looked up similar questions here and have considered their solutions in deleting (not just blanking, but actually removing entirely) all columns I am not using and re-selecting the Source Path and Worksheet Name/Qualifier and of course regenerating structure (all and several times). None has worked.

Anyone able to help?