app.js role play

[le-wei]

I run this demo. The following error occurred

Uncaught TypeError: Cannot read property 'addRule' of undefined at Object. (F:\test\node_modules\wcjs-player\index.js:41:36) at Module._compile (module.js:648:30) at Object.Module._extensions..js (module.js:665:10) at Module.load (module.js:569:32) at tryModuleLoad (module.js:532:12) at Function.Module._load (module.js:524:3) at Module.require (module.js:592:17) at require (internal/module.js:11:18) at self.require (:11:26)

I do not know why.can you help me 。Thank you