Turbo tac

I did my yac last year on turbo tax and I'm filing this year I've had problems with my AGI. It told me to go to my documents and find my Agi from last year and when I would enter it . It kept failing to the point where I had to just print everything out and mail it out to IRS. They then send me a letter that they need more info on HOW I got the amount of something. Or I will owe them $1,058.what do I do.??

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