 		@_client.on("authenticationFailed", ()->
 			Log.info("ZKClient receive event:authenticationFailed")
 		)
+		@_client.ont("")
 		
 	exists : (path, val, cb)->
 		@_client.exists(path, null, -1, cb)

						if err.getCode() == ZK.Exception.NO_NODE
							Log.error("NO_NODE found for path: #{path}")
							return
						else if err.getCode() == ZK.Exception.CONNECTION_LOSS
							@_client.connect()
						if cb
							return cb(err, null, null)
						else

						if err.getCode() == ZK.Exception.NO_NODE
							Log.error("NO_NODE found for path: #{path}")
							return
						if cb
							return cb(err, null, null)
						else
