You can enter the income directly on your self employment schedule without entering the 1099-NEC.
It sounds like you could try clearing the cookies and cache and I'll provide the instruction, however my advice will allow you to move forward as well.
In this situation, first please try clearing the cookies and cache. It handles many issues that seem nonsensical on a regular basis.
- Close your TurboTax return first.
Watch to be sure you are selecting 'all time' as example. Do not use selections like 'last hour' for those browsers that give you options.
Once this is complete open your return and see if the error is gone.