Turbo Tax 2024 is asking "Form 760C: Line 3: Prior year tax liability must be entered." Which line(s) do I use from my 2023 Form 760 or Form 760CG (Computer Generated)?

Turbo Tax 2024 flagged an error indicating Form 760C: Line 3 is blank. I have no idea what value goes here. I can open any form from my Turbo Tax 2023 filing. Please help. Thank you!