If you are referring to an AGI issue that is preventing you from filing your return, this is an IRS requirement - not a TurboTax one. So, even if you said you didn't file taxes last year, the IRS would still have your records and would reject your e-file because they know you did file taxes.
You can try to use the information in this article below to access your AGI information - there is a link that will take you to the IRS website and you can try to order a transcript to find your AGI. The other option if you just can't get it is to paper file your return. The AGI number is only required for e-filing, but you can still print your return and mail it.