Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., nu

所有的flutter第三方插件报错：

E/flutter ( 6441): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null)
E/flutter ( 6441): #0      PathProviderApi.getApplicationDocumentsPath (package:path_provider_android/messages.g.dart:97:7)
E/flutter ( 6441): 
E/flutter ( 6441): #1      getApplicationDocumentsDirectory (package:path_provider/path_provider.dart:115:24)
E/flutter ( 6441): 
E/flutter ( 6441): #2      _FileContainerState.build..
package:whatsapp_redesign/…/chat/file_container.dart:56
E/flutter ( 6441): 

解决办法：在Android项目的MainActivity中添加下面的代码：

  override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine)//1、注册插件
    }