You can receive your AGI directly from the IRS if you do not have your 1040. Please follow the Turbo Tax FAQ on how to retrieve your 2017 AGI.
Then can re-file. Step #4 will be to re-file your return. Please read the TurboTax FAQ listed below and follow the instructions to fix your rejected return.
https://ttlc.intuit.com/replies/3301618
https://ttlc.intuit.com/replies/3302275
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