Puck.js and Node-RED with MQTT

I followed the instruction on: https://github.com/espruino/EspruinoHub
section: Installation of everything (EspruinoHub, Node-RED, Web IDE)

I'm getting the following error:

events.js:183
      throw er; // Unhandled 'error' event
      ^

Error: connect ECONNREFUSED 127.0.0.1:1883
    at Object._errnoException (util.js:992:11)
    at _exceptionWithHostPort (util.js:1014:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1186:14)

after doing at ./start.sh from the EspruinoHub directory or trying to go to
http://192.168.2.86:1888/mqtt.html.

I'm not sure how I could fix this or what did I miss.

Thank you