Help with form 8379

[Bella2021]

I need help with form 8379. I am filing an injured spouse form due to my spouse owing arrears in child support, he is disabled and has filed for disability. I have an error on line 15G of Line 15. I am using the turbotax deluxe desktop version. When I clicked on the red error box in the upper left hand corner, I said "Line 15G Joint must be equal to the sum of line 15G(b) and 15G(c). Please check your entries from this line." I have an entry on line 15A, 15B, and 15D, but nothing on 15C. I cannot actually change anything so I am not sure why this error populated. How can I fix this. 

[rjs]

Duplicate question. Please post your question only once. If you want to add more information or post a follow-up question, add a reply to your original question. Do not post separate questions about the same issue.