Unhandled Exception: 'package:flutter_downloader/src/downloader.dart': Failed assertion: line 390 pos 12: 'callbackHandle != null': callback must be a top-level or a static function

[zzb999]

Unhandled Exception: 'package:flutter_downloader/src/downloader.dart': Failed assertion: line 390 pos 12: 'callbackHandle != null': callback must be a top-level or a static function

[hehuapei]

#4 对的，是有这个问题，原因是下载组件有变化