         }
 
         private function _callMethod(eventData:Object):void {
-            var methodName:String = eventData.method;
+            var methodName:String = eventData[METHOD];
             if (!methodName) {
                 throw new Error('[KrewEventPlayer] method name not found. (trigger: '
-                                + eventData.trigger_key + ')');
+                                + eventData[TRIGGER_KEY] + ')');
                 return;
             }
 


            _eventsByTrigger = {};
            for each (var eventData:Object in _eventList) {
                var triggerKey:String = eventData.trigger_key;
                if (!triggerKey) { continue; }

                if (!_eventsByTrigger[triggerKey]) {

                return;
            }

            method(eventData[PARAMS], function():void {
                _callNextMethod(eventData);
            });
        }
