[]Cannot read property 'call' of undefined

当我新建GameScene并添加到舞台时，抛出了异常，求助该怎么解决




 
详细日志：
"TypeError: Cannot read property 'call' of undefined    at Function.<anonymous> (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/bin/libs/laya.core.js:130:41)    at new GameScene (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/src/GameScene.js:4:19)    at HomePageUI.onGameStart (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/src/HomePage.js:78:27)    at EventHandler.__proto.runWith (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/bin/libs/laya.core.js:724:59)    at Button.__proto.event (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/bin/libs/laya.core.js:499:30)    at TouchManager.__proto.sendEvents (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/bin/libs/laya.core.js:3340:7)    at TouchManager.__proto.onMouseUp (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/bin/libs/laya.core.js:3499:10)    at MouseManager.__proto.onMouseUp (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/bin/libs/laya.core.js:3043:18)    at MouseManager.__proto.check (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/bin/libs/laya.core.js:3070:13)    at MouseManager.__proto.check (file:///Users/moos/Company/Emerson-AirWar/EmersonGame/bin/libs/laya.core.js:3063:15)"