Just like @DianeW777 I am unable to get the same error that you are experiencing Tim3320070. It isn't a known error. That leads me to believe that you have entered something in error to get here.
Make sure that you are doing the tax return for Indiana first BEFORE the return for Illinois. You'll do a 'part year resident' return for each and tell them what dates you lived there.
Also, go back to your 'Personal Info' section and make sure that the question "Did you earn income in any other states?" is marked "Yes" and has Indiana selected.
If all of that looks good then you are probably better off having someone walk through the return with you to look at your entries so I recommend getting live expert help.
Here is a link to finding a TurboTax expert.
However, that requires upgrading your product which may be an expense you don't want. In that case you can call an expert and ask questions over the phone.
Here is a link to the TurboTax Phone Number.
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