Either not enough taxes were withheld or there could be a typo. Try these things:
* Double check that you actually typed in what is on your W2.
* Compare the W2 to your last paystub. Is the W2 number close?
* Check with your accounting department to see what you claimed. You may need to change your withholding.
* Read the state filing instructions posted below. There could be something else triggering your issue.
This link on filing non resident returns may help as well.
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