The transmissions for 2021 are ready, however, this error message is due to some state forms, not being available right now. A workaround for this is to only e-file Federal and change the state filing method to file later.
Please see this TurboTax FAQ for more information, Can I file my federal taxes now and skip my state for later?
Also, check this State Form Availability Table to see when your state forms will be available.
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