React-Native：undefined不是对象（评估'this.props = props'）

我是React-native的新手，我正尝试将dialogflow与react-native集成。

我的代码是：

import React, {Component} from 'react';
import { StyleSheet, View, Button } from 'react-native';
import { Dialogflow_V2 } from "react-native-dialogflow";

class App extends Component() {
  constructor(props) {
    super(props);

    Dialogflow_V2.setConfiguration(
        "sample.iam.gserviceaccount.com",
        '-----BEGIN PRIVATE KEY-----\sample\n-----END PRIVATE KEY-----\n"',
        Dialogflow_V2.LANG_ENGLISH,
        'sample-44ce3'
    );
  }
  render() {
    const { dialogflow } = this.props.Dialogflow_V2;
    return (
      <View style={styles.container}>
        <Button onPress={() => {
            dialogflow.requestQuery("hello", result=>console.log(result), error=>console.log(error));
          }}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});

export default App;

但这告诉我这个错误

谁能向我解释这到底是什么问题，需要什么纠正？提前致谢。