I'm so very sorry to hear about your husband's passing. Please accept my condolences.
I'm hoping that you can enter 0 as your AGI and get this through. There are a few reasons why your federal return may be rejected. And there may be a way to e-file it successfully. I'm sharing with you a TurboTax FAQ that may help.
What if I entered the correct AGI and I'm still getting an e-file rejection?
Hope this helps! Keeping my fingers crossed!
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***