Illinois starts with federal income. The state will reject your return until your federal return is accepted. Once the IRS accepts your return, you can re-file Illinois.
If the IRS is rejecting your return and you believe your AGI is correct, get a transcript from the IRS. It will show the AGI the IRS has on file for you. It may be different due to an IRS adjustment.
You can obtain an IRS transcript at Welcome to Get Transcript.
If the AGI on the IRS transcript matches the AGI you have been using, there's a system issue at the IRS and you will have to file by mail.
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