Deductions & credits

Using the TurboTax desktop editions for tax year 2021 -

 

To remove the error I went into Forms mode and deleted the Charitable Organization Worksheet(s).  Then on the Form 1040 Worksheet for Line 12b removed the $300 amount so Line 12b is now blank (empty).

Going back to Step-by-Step I completed the Deductions & Credits section without entering anything for a charitable donation.  Continuing through the screens until landing on the screen labeled Charitable Cash Contributions under Cares Act, I entered $600.  Continued through Final Review without error.