X_IMPORT_HEADER_MISMATCH

the csv header does not name the declared columns

the first line of the file names columns importRows() does not declare, or omits some it does — the cause lists both sides, missing and undeclared, so a renamed spreadsheet column is visible before any row is read

edit the file's header row to the declared columns, or edit columns on importRows("<name>") to match the file, then re-enqueue with a new key