An unhandled exception occurred: Port 4200 is already in use + docker code example

Example 1: Port 4200 is already in use. Use '--port' to specify a different port

sudo lsof -t -i tcp:4200 | xargs kill -9

Example 2: how to close all ports angular

If you use 'Visual Studio Code' just click on the 'kill Terminal' on the top-right of the terminal and all the terminals ports will colsed