运行时突然EventEmitter报错

报错详情：
Uncaught (in promise) Error: Unhandled error. (undefined)
    at EventEmitter.emit (events.js:142:1)
    at EventEmitter.<anonymous> (flv-player.js:236:1)
    at EventEmitter.emit (events.js:153:1)
    at transmuxer.js:189:1

请问是什么原因