Extension build fails on dotnet run after switching git branch

I am running 16.2.0-rc2. I was testing something on a git branch but decided to go a different direction. I discarded all of the changes switched back to my master branch, but now when I run dotnet run on my master branch I get the error:

The command "npm run build" exited with code 127.

If I run npm run build in the extension everything is fine.

I tried dotnet clean and dotnet build but I can’t get the error to go away. I did comment out the npm run build in the ext.csproj file so I can keep working.