Error
Your tax family size, Form 8962, line 1, does not match your family size reflected on page 1 of Form 1040.
Solution
Review the instructions for Form 8962, line 1, to determine your tax family size and enter that number on Form 8962, line 1
Make the correction(s) and resubmit.
If you are making a payment, you may have to re-date Step 3, Payment Options.