Error No implementation found for method makeCall

[alexlovar]

the function makeCall does not work, i test with a valid token server, and i haver this error when i call the function:

 onPressed: () async {
                   // FlutterTwilioVoice.phoneCallEventSubscription.listen(_onEvent, onError: _onError);
                    //FlutterTwilioVoice.receiveCalls(_fromController.text);
                    FlutterTwilioVoice.makeCall(
                        from: "+1********",
                        to: _toController.text,
                        accessTokenUrl: "https://valid_token_server",
                        toDisplayName: "Jhon_Doe");
                  },

E/flutter ( 1695): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: MissingPluginException(No implementation found for method makeCall on channel flutter_twilio_voice)
E/flutter ( 1695): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:156:7)
E/flutter ( 1695): <asynchronous suspension>
E/flutter ( 1695): #1      FlutterTwilioVoice.makeCall (package:flutter_twilio_voice/flutter_twilio_voice.dart:34:5)
E/flutter ( 1695): <asynchronous suspension>