yarn start error error listen EADDRINUSE: address already in use :::8081. code example

Example 1: Error: listen EADDRINUSE: address already in use :::8080

ps aux | grep node //gets all the nodes and list of PID
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)