If the 2017 AGI is correct but the IRS rejected the tax return then try entering a 0 (zero) for the 2017 AGI. If the IRS rejects the tax return again for the AGI then you will have to print and mail the tax return.
See this TurboTax support FAQ for the procedure to print a tax return for mailing when using the online editions - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online...
