I too have this problem in Turbo Tax 2021 Home and Business running in Windows 10. I have already saved the tax return and calculation worksheets in PDF format to my computer so that works. But right after filing the Federal and State returns I got this page saying I had to send in some paperwork. None of the options to create and save a PDF or print a form work - they all fail with this Error in converting your forms to PDF format. I am up to date (it updated today) and have no idea what this form is. There is nothing in the tax return which looks like a form that I need to mail.
One possible answer for me - there is a note that I need to mail copies of a Long Term care premium to West Virginia. Perhaps the system is trying to print that out?
