flutter: start download.
[VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: MissingPluginException(No implementation found for method getApplicationDocumentsDirectory on channel plugins.flutter.io/path_provider)
#0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:313:7)

#1 getApplicationDocumentsDirectory (package:path_provider/path_provider.dart:120:24)

#2 HiDownLoad.download (package:hi_download/hi_download.dart:22:17)

#3 _HiDownLoadPageState._doDownLoad (package:flutter_network/hi_download_page.dart:32:12)