You should not need to enter anything in that box - TurboTax should fill it. However, since you are getting an error. what goes there is the withholding for the state for each taxpayer for each form that has withholding.
I was able to reproduce this error by creating a test return with a couple married filing jointly, where each taxpayer has a W-2. But when I entered the spouse's W-2, I made sure that Box 16 was blank, even though there were entries in boxes 15 and 17.
I would encourage you to go to your W-2s and 1099's and check the line for withholding (boxes 15-17 for the W-2, boxes 14-16 for the 1099-R, and so on.
Note that if the "IN" is there for Indiana, but there is nothing else in the other boxes, please delete the IN.
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