After a lot searching today for a solution to this error, I decided to post the solution here so it may be easier found by others. The error “Ambiguous Row Type” occurs if you upload the keywords column with the other 20+ columns of data to the Google Adword Editor.
The solution is to remove the keywords column and upload. Then, built a second spreadsheet containing the following columns:
This will upload and update your existing ads with the keyword. Hope that helps!