An NOL (Net Operating Loss) is a negative overall income for this or a prior year. It goes on your return as a negative and reduces your income. If you had a negative income in a prior year and carried it into this year then the explanation would be "NOL carryforward from prior year".
If you have not used a negative number intentionally in your preparation of your tax return then you need to go back through your federal return and see why it thinks you have entered a negative number.
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