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Hey! They same exact thing happened to me. I filled the Non-filers thinking I needed to it in order to get the stimulus check, and now I can't file my taxes. Anyways, what did you choose to do? Did you just mail the 1040? How did you make the notation for 1040X? Where did you get the IRS address? Did you consult with someone else about this? I would appreciate your response! Thanks in advance.