Problem: The State of Illinois - not eFile.com - rejected your return because the IL Tax Return data you entered does not match that data the IL database shows e.g. Names etc. SSN, Signature etc.
Solution: Sign into your eFile.com account at https://mytaxes.efile.com/1040/SignIn/, click State Taxes on the left side and then the link-> I'd like to see all my state forms. Go through your State Tax Forms and make sure the data there matches that of the IL Driver license data on file. Complete this form and re-efile your federal and state returns at no additional charge. Note: If IL is not accepting returns yet, please wait and re-eFile later.
Contact us with questions: https://www.efile.com/tax-service/contact/efile-contact/