websocket - PrimeFaces Notify -

I am trying to implement primfolks I applied the exact code shown in the linked example but every The times when I try to run it, I get the following error in the web console.

  Websocket failed. Downgrading the comet and resetting the push. Js.xhtml? Ln = Primefaces & amp; V = 5.1: 1 get http: // localhost: 8080 / notify / primepush / notify? X-Atmosphere-Tracking-ID = 0 & amp; ... NG and X-Atmosphere - TrackMessageSize = True and X-Atom Protocol = True & amp; I have satisfied all the dependencies for Primetime 5.1 and JSF 2.2.6. I'm really stuck on this one, I can not understand what I'm missing.   
 
 
 I think your problem is here.  
 Include this among the UI in your .xhtml file: Define and script tags  
   
  Public invalid execute group message () {RequestContext.getCurrentInstance () . Execute ("doGrowling ();"); }