After you file

Sounds like you switched to a mailed in return and not a refund mailed to you  ... they are totally separate things.   Now you can fix the rejection error and efile again ... log in and scroll down and click on ADD A STATE to reopen the return and complete the FILE tab again after fixing the rejection error.   If you cannot successfully efile the return then it will need to be mailed in ... follow the filing instructions that are included in the PDF.