title: How can I solve the `--port` error in meteor js
body: <p>When I restart Meteor in linux cent-os, I get the following console error:</p>
  <blockquote>
  <p>Can't listen on port 3000. Perhaps another Meteor is running?</p>
  <p>Running two copies of Meteor in the same application directory will not work. If something else is using port 3000, you can specify an alternative port with --port <em>&lt;port&gt;</em>.</p>
  </blockquote>