Its 1/29/24... I tried to e-file and I got the same error message saying I have forms that will not allow me to e-file and must do so by mail. After reading several comments here in the community, the problem appears to be with Schedule C. Sure enough, when I deleted all entries related to business income and removed Schedule C from my forms, it would no longer throw the error and would allow me to e-file. So it certainly appears to be a TurboTax issue. Hopefully they can send a patch through and allow all of us to keep our Schedule C when e-filing. (One thought... I am using the Deluxe version, because my Schedule C income is very minimal. However, when trying to correct forms - before deleting Schedule C - TT asked me if I wanted to upgrade to a version that supports small businesses. I declined. I hope this software glitch is not a way for them to force us to purchase a different level of TT support when it is really not needed.)