[LayaAir 2.0]TypeError: Laya.MovieClip is not a constructor

let mc:Laya.MovieClicp = new Laya.MoveClip();
 
 
报错：
TypeError: Laya.MovieClip is not a constructor
preload.js:55
at XLoadUIScript.32.XLoadUIScript._init (file:///D:/1MiniGame/mini-game-client/minigame1/bin/js/bundle.js:3001:18)
 
at XLoadUIScript.32.XLoadUIScript.onStart (file:///D:/1MiniGame/mini-game-client/minigame1/bin/js/bundle.js:2939:14)
 
at LaterHandler.__proto.run (file:///D:/1MiniGame/mini-game-client/minigame1/bin/libs/laya.core.js:6143:45)
 
at CallLater.__proto._update (file:///D:/1MiniGame/mini-game-client/minigame1/bin/libs/laya.core.js:6066:14)
 
at Stage.__proto.render (file:///D:/1MiniGame/mini-game-client/minigame1/bin/libs/laya.core.js:21377:16)
 
at Stage.__proto._loop (file:///D:/1MiniGame/mini-game-client/minigame1/bin/libs/laya.core.js:21330:8)
 
at loop (file:///D:/1MiniGame/mini-game-client/minigame1/bin/libs/laya.core.js:9407:15)