I keep getting an error that SC1040ES1:City - Voucher 1 has too many characters. I'm not even using that form and the field is blank.

I had the exact same issue when trying to E-file my SC NR return. I was unable to go beyond the error "SC1040ES1:City - Voucher 1 has too many characters." and the form would display with a blank field. I finally tried actually entering something into the field and then deleting it and everything started working as it should. The checks all passed and the E-file process worked without issue.

I finally was able to get technical support through their Twitter account and they had me put a zero in the field.