If your tax return continues to be rejected with the 2018 AGI then enter a 0 (zero) for the AGI and e-file again.
If this is also rejected then you will have to print and mail the tax return.
See this TurboTax support FAQ for printing a tax return for mailing - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online...
You can only e-file your state return if you are able to e-file your federal return.
If you were not able to electronically file your federal return, your state e-file will also be rejected and you will need to mail the state return in as well.
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