For help fixing your rejected Illinois tax return please go through the steps outlined below.
Note: After trying the below steps if you get the same rejection a second time (or third, or fourth...) and you see no mistakes on your return, select the file by mail option to paper-file your return. See: How do I print and mail my return in TurboTax Online?
See TurboTax FAQ: https://ttlc.intuit.com/replies/3302275
