If you didn't file a 2016 tax return with the IRS, just tell us you
didn’t file last year when we ask you. But if you’ve already entered a
number for your AGI, manually enter 0 instead. Please see the following FAQ's on AGI and how to fix a rejected return:
https://ttlc.intuit.com/replies/5595742
https://ttlc.intuit.com/replies/3302275
