ERROR: The command 'foreman start"

ERROR: The command 'foreman start"

19:20:41 frontend.1 | error when starting dev server: 

19:20:41 frontend.1 | Error: Port 3036 is already in use 

19:20:41 frontend.1 |  at Server.onError 

SOLUTION:

$ lsof -wni tcp:3036

$ sudo kill -9 PID

REFERENCE:

- https://stackoverflow.com/questions/31039998/rails-address-already-in-use-bind2-errnoeaddrinuse