An unhandled exception occurred: Port 4200 is already in use. Use '--port' to specify a different port. See "/private/var/folders/3j/dtrpgrjs2bz0vrbp1t4p3cz40000gn/T/ng-lMZWkc/angular-errors.log" for further details. code example

Example: cancel ng server port

Using your terminal, find the PID of port 4200
netstat -ano | findstr :4200

Kill task by the PID Number (Replace 15940)
taskkill /PID 15940 /F