When running the terminal commands
ng server or
ng serve --live-reload=true , I'm getting this issue.
The serve command requires to be run in an Angular project, but a project definition could not be found.
I also had this issue which i resolved by running the command below
ng update @angular/cli --migrate-only --from=<WhateverVersionYouAreCurrentlyOn>
ng update @angular/cli --migrate-only --from=1.7.3
getting ref from here