The only time you should see that error is if the WordPress function that updates a table row returns a “false” type result, meaning that either the table data was not successfully update, or nothing was changed. If there was not an error, WordPress returns the # of rows updated, which would be 0 if nothing was changed in the sheet (not the tasks). There is one spot in my code that I didn’t fully check if it was a 0 value versus “false”, which can both evaluate the same if you don’t check exactly for false, so that may be what you are seeing… nothing changed for the sheet, so nothing was updated (although tasks data may have been changed, but that’s a separate table).
If everything is working fine, then that’s most likely what you’re seeing, and I’ll fix that minor code discrepancy in the next release.