An unhandled exception occurred: Port 4200 is already in use. Use --port to specify a different port. See C:\Users\doc\AppData\Local\Temp\ng-wKWBxJ\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