Form 8453-FE in TurboTax Business - Says "Do Not File"

I am filing a final estate tax return. TurboTax Business says there are no errors but when I try to e-file, it asks me to print, sign, and scan back in Form 8453-FE. But the form has watermarks that say "Do Not File" and "Return Not Final". Do I sign and attach anyway or is there some kind of error? I just updated TurboTax at the beginning of this session.