I am being asked by the state of IL to provide my CA state tax return to prove I lived there in 2015. Any help on how to get my CA state tax return from 2015?

I have downloaded my turbo tax file, and purchased an official 2015 turbo tax disc. It encounters error 190, then says I need to download my state. I tried to and it said it ran into an error. How can I get the state return? Or will the tax file only have federal?