Issue with requiring define-ack

[p4ulcristian]

 (ns socketcluster-clj.events
   (:require
     [socketcluster-clj.listeners :refer [define-listener define-ack-listener]]))

Misses define-ack
Also socketcluster-clj.channels
I don't know why does it work in your example, but with this error I couldn't import your library.

 (ns socketcluster-clj.events
   (:require
     [socketcluster-clj.listeners :refer [define-listener define-ack-listener define-ack]]))