Category Report workflow question - Required Header "Description" was not found in sheet."

I have a question about the Category Report workflow from Tiller Community Solutions.
I get an error message:
“Category Report
Transactions sheet: Required Header “Description” was not found in sheet.”

How do I correct?

That should mean that your Transactions sheet doesn’t have a header called Description… but all Tiller spreadsheets (especially those seeded with the Foundation Template) include this column. Are you using a Tiller spreadsheet? Is it possible you deleted this column? Or typed over the header?