The following error shows up on Schedule NEC of 1040NR:

"Line 9, column (c) should not be greater than zero if Schedule OI Line B country of residency is Taiwan"

The NRA is a F1 student who's been the USA for more than 183 days. And there is no tax treaty between the USA and Taiwan, so capital gains should be taxed at 30%. (IRS)

This is capital gains incomes from stock trades in taxpayer's personal account (e.g. Robinhood)

Does anyone know why I'm getting this error?

Thanks.

Alex