mimi121,
Most likely you accidentally hit the e-file button twice. If you had e-filed and then went back and changed something, you don't re-efile, but you amend instead once you get confirmation that the return was accepted and that your refund, if any, was received.
However, there is, of course, the possibility that someone else has unlawfully filed a return using your identity. What was the Reject Code that accompanied the message?
