A blank box 15 state employer ID on your W-2 should not cause a problem with your return processing at the IRS or the state revenue office. If there are no entries in box 17, you may leave box 15 and 16 blank, as well.
If you do have entries in box 17 and you are in Utah, there should be 11 numerals followed by WTH (in capitols) with no dash. Try using 99999999WTH or 8 digits of the federal ID with WTH at the end.
If the error persists, try deleting the form and reentering it. If you have "copied and pasted" to enter some of the information, it might have spaces or other invisible formatting characters that are causing the errors. Please be sure there are no extra spaces before the entries or after the entries. If you have imported into Turbo Tax, perhaps some of the data was damaged in the transfer and is not working properly, even if it looks correct on the page. Deleting the W-2 and manually entering it should solve the problem.
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