"polka" Error: listen EADDRINUSE: address already in use code example

Example 1: EADDRINUSE: address already in use

sudo lsof -i :<PORT>
kill -9 <PID>

Example 2: Error: listen EADDRINUSE: address already in use

Find server pid:
	lsof -i tcp:5000 (the 5000 is the port number)
kill the server:
	kill -9 111119 (the 111119 is the pid)