在下面接收到的方法中调用拒绝，报错如下：

_client?.getRtmCallManager().refuseRemoteInvitation(remoteInvitation)

 _client?.getRtmCallManager().onRemoteInvitationReceived =
        (RemoteInvitation remoteInvitation) async{
        
        }
       

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Instance of 'AgoraRtmCallManagerException'

#0 AgoraRtmPlugin.callMethodForCallManager.<anonymous closure> (package:agora_rtm/src/agora_rtm_plugin.dart:52:9)

<asynchronous suspension>