If your form has nothing shown for the state ID number, no state winnings, and no state tax withheld, then don't choose anything from the drop-down list of state names and leave the other state fields blank. This should resolve the error. The instructions for Boxes 13-18 indicate "Leave blank if empty on your form".
Box 13 on Form W-2G is for the State payer ID number. TurboTax also provides a drop-down menu to choose the name of the state, which is actually not shown in box 13, but only in the payer address field.
If you live in California, a state with income tax, you only need a payer ID number if there was California withholding entered. If not, don't select California and leave the other state boxes blank.
See this TurboTax tips article for more information on Form W-2G.
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