Please be more specific what you did?
It is impossible to e-file using the 2018 software. Did you enter 2018 tax information into the 2019 software?
Print the tax return - what year is on top of the 1040 form?
If you were doing a 2018 tax return now, you cannot file it electronically. It would have to be mailed. If it was not mailed, it was not filed.
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