After you file

....separate file ending   .tax2021 in your case.

 

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Also My  repeat response to your duplicate post:

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Two things to try...but use both in succession.

 

Close TTX, then

1)  rt-click on the 2021 TTX startup icon and select "Run as Administrator"

Once started:
2) go to the top menu, select the "Online" popup/pulldown menu and select "Check for Updates", and run any updates.

 

Then try to open that file.

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Otherwise, time to call Customer Support:

What is the TurboTax phone number?

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Remember too, you can only print and file by mail at this late date.

 

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*