flutter – erro ao enviar e-mail pacote flutter_email_sender

Bom dia a todos, estou fazendo um site no Flutter, mas na área de de contato por email estou com problema ao utilizar o pacote flutter_email_sender, na qual quando preencho o formulário e envio a mensagem, aparece o seguinte erro:

Console:

email - > xxxx@gmail.com  message -> hellooo
Error: MissingPluginException(No implementation found for method send on channel flutter_email_sender)
    at Object.throw_ (as throw) (http://localhost:58166/dart_sdk.js:5334:11)
    at MethodChannel._invokeMethod (http://localhost:58166/packages/flutter/src/services/system_channels.dart.lib.js:954:21)
    at _invokeMethod.next (<anonymous>)
    at http://localhost:58166/dart_sdk.js:39032:33
    at _RootZone.runUnary (http://localhost:58166/dart_sdk.js:38889:58)
    at _FutureListener.thenAwait.handleValue (http://localhost:58166/dart_sdk.js:33875:29)
    at handleValueCallback (http://localhost:58166/dart_sdk.js:34435:49)
    at Function._propagateToListeners (http://localhost:58166/dart_sdk.js:34473:17)

A implementação do site é a seguinte:

import 'package:flutter/material.dart';
import 'package:flutter_email_sender/flutter_email_sender.dart';

class ContactView extends StatefulWidget {
  @override
  _ContactViewState createState() => _ContactViewState();
}

class _ContactViewState extends State<ContactView> {
  var _emailFormKey = GlobalKey<FormState>();

  TextEditingController nameController = new TextEditingController();
  TextEditingController emailController = new TextEditingController();
  TextEditingController messageController = new TextEditingController();

  String value;

  @override
  Widget build(BuildContext context) {
    return Column(children: (
//Header page
      Padding(
        padding: EdgeInsets.only(left: 15.0),
        child: Text(
          "Contact",
          style:
              TextStyle(fontWeight: FontWeight.w800, height: 3.0, fontSize: 24),
        ),
      ),
      SizedBox(
        height: 30,
      ),
    //Enter Forms
      Form(
          key: _emailFormKey,
          child: Column(
            children: (
              Container(
                  margin: EdgeInsets.only(top: 50, left: 15, right: 15),
                  child: TextFormField(
                    controller: nameController,
    //Validator name
                    validator: (value) {
                      if (value.isEmpty) {
                        return 'please Enter your name';
                      }
                    },
                    decoration: InputDecoration(
                        labelText: "Enter name",
                        border: OutlineInputBorder(
                            borderSide:
                                BorderSide(color: Colors.black54, width: 2))),
                  )),
              Container(
                  margin: EdgeInsets.only(top: 50, left: 15, right: 15),
                  child: TextFormField(
                    controller: emailController,
    //Validator email
                    validator: (value) {
                      if (value.isEmpty) {
                        return 'please Enter email';
                      }
                    },
                    decoration: InputDecoration(
                        labelText: "Enter email",
                        border: OutlineInputBorder(
                            borderSide:
                                BorderSide(color: Colors.black54, width: 2))),
                  )),
              Container(
                  margin: EdgeInsets.only(top: 50, left: 15, right: 15),
                  child: TextFormField(
                    controller: messageController,
    //Validator message
                    validator: (value) {
                      if (value.isEmpty) {
                        return "please Enter message";
                      }
                    },
                    decoration: InputDecoration(
                        labelText: "Enter message",
                        border: OutlineInputBorder(
                            borderSide:
                                BorderSide(color: Colors.black54, width: 2))),
                  )),
              Container(
                margin: EdgeInsets.only(top: 15),
                child: RaisedButton(
                    child: Text("Send"),
                    onPressed: () {
                      if (_emailFormKey.currentState.validate()) {
                        sendMessage();
                      }
                    }),
              )
            ),
          ))
    ));
  }


//Function to send message
  void sendMessage() {
    String inputName;
    String inputEmail;
    String inputMessage;
    Email email;
    setState(() {
      inputEmail = emailController.text;
      inputMessage = messageController.text;
      inputName = nameController.text;
      if (inputMessage.isNotEmpty &&
          inputEmail.isNotEmpty &&
          inputName.isNotEmpty) {
       //package flutter_email_sender
        email = Email(
          body: inputMessage,
          subject: inputName,
          recipients: ('xxx@gmail.com'),
          isHTML: false,
        );
        send(email);
      }
    });
    debugPrint('email - > $inputEmail  message -> $inputMessage');
  }

  void send(Email email) async {
    await FlutterEmailSender.send(email);
  }
}

Neste sentido, gostaria de saber se alguém já passou por este erro ou tem alguma ideia de como resolvê-lo a partir desta implementação, estive pensando se está relacionado ao site ainda não está hospedado. Agradeço desde já quem auxiliar na resolução!!