Turbo tax error: "Return cannot be e-filed when the sum of Illinois wages + out of state wages on all W-2s <> total wages on IL Schedule CR. W-2 error or legit?

The wages are not matching up for the totals. You need to go back into the w2 screen and adjust the wages. You can adjust the w2 state income section to match the reality of the year. Sometimes an employer will list 2 or 3 states with income that totals more than the federal income box amount. The IL wages plus out of state wages should equal the total of your income. The IL Sch CR should capture those out of state wages along with any taxes paid to other states while an IL resident,