There was a known error with the 1099-NEC input section.
This is supposedly fixed. Not sure this is why you are having issues, however, take a look at the following response on the issue.
Make sure you check for current updates as well.
https://ttlc.intuit.com/community/business-taxes/discussion/the-1099-nec-schedule-c-screen-isn-t-wor...
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
