Error Message when attempting to transmit Efile

[KW1975]

Hello, 

I'm attempting to transmit my EFile for 2021 Federal and State (CA) tax returns, and I get this message when I click the " Transmit Returns Now" button:

Refund Transfer payment method isn't available right now. To finish e-filing your return, select the option to pay with your CC or try again later."

[Mike9241]

Tutbotax has shut down e-filing for 2021. the return will have to be mailed in 

[KW1975]

OK.  One more question.  Is there somewhere I can see what forms exactly need to be mailed in?  I have over 300 pages of documents when I download the return and everything else.  Some of it doesn't even seem relevant.  Is there a list of what is definitely needed for both Fed and State?  Thanks.