An unhandled exception occurred: Port 4200 is already in use. Use '--port' to specify a different port. See "/private/var/folders/q4/k_7f5gx16n38xyk28kn3lt000000gn/T/ng-NcG1IN/angular-errors.log" for further details. code example

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