可能的未处理的承诺拒绝（id：6）：找不到Firebase身份验证

Question

所以这是我第一次使用堆栈溢出，如果这看起来不好，我感到抱歉！我在设置React Native App Firebase身份验证时遇到问题。我希望我的用户先登录然后再进入下一个屏幕。我的问题是我遇到了Firebase无法进行身份验证的麻烦。我一直在查看google firebase文档和其他堆栈问题，但没有一个帮助我。

这是我的代码：

//React and CSS
import * as React from 'react';
import {View, Text, StyleSheet, TextInput} from 'react-native';
import LoginButton from '../components/LoginButton';
import ForgotPassButton from '../components/ForgotPassButton';

//Help screen after login
import Help from '../pages/Help';

// Login Function
import firebase from '@react-native-firebase/auth';

class LoginForum extends React.Component {
async _logMeIn() {
    console.log('hi');
    firebase
      .auth()
      .signInWithEmailAndPassword('Janunda@ivytech.edu', 'Pa$$w0rd')
      .then(() => this.props.navigation.navigate('Help'))
      .catch(error => this.setState({errorMessage: error.message}));
  }

  render() {
    return (
      <View style={styles.backgroundColor}>
        <TextInput
          style={styles.userInput}
          placeholder="Email"
          placeholderTextColor="rgba(255,255,255,0.8)"
          returnKeyType="next"
        />
        <TextInput
          style={styles.userInput}
          placeholder="Password"
          placeholderTextColor="rgba(255,255,255,0.8)"
        />
        <LoginButton
          buttonName="Login"
          customTouchableStyle={{
            width: '75%',
            height: '50%',
          }}
          customViewStyle={{backgroundColor: '#FFAB40'}}
          onPress={this._logMeIn}
        />
        <ForgotPassButton
          buttonName="Forgot Password"
          customTouchableStyle={{
            width: '10%',
            height: '40%',
          }}
          customViewStyle={{backgroundColor: '#EB3461'}}
          // onPress={userLogin.handleLogin}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  userInput: {
    width: '75%',
    padding: 10,
    marginBottom: 10,
    height: 50,
    paddingHorizontal: 10,
    marginTop: 58,
    color: '#FFFFFF',
    flexGrow: 1,
    fontSize: 25,
  },
  loginButton: {
    height: 70,
    paddingVertical: 20,
    backgroundColor: 'rgba(255,255,0,1.8)',
  },
  loginText: {
    fontWeight: '700',
    textAlign: 'center',
    color: '#FFFFFF',
    fontSize: 20,
  },
  forgotPassword: {
    fontWeight: '700',
    textAlign: 'center',
    color: '#FFFFFF',
    padding: 30,
    fontSize: 20,
  },
});

export default LoginForum;

错误：

Possible Unhandled Promise Rejection (id: 6):
TypeError: _auth.default.auth is not a function. (In '_auth.default.auth()', '_auth.default.auth' is undefined)
_logMeIn$@http://localhost:8081/forum/LoginForum.bundle?platform=ios&dev=true&minify=false&modulesOnly=true&runModule=false&shallow=true:65:35
tryCatch@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:30556:23
invoke@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:30732:32
tryCatch@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:30556:23
invoke@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:30632:30
http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:30662:19
tryCallTwo@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:3329:9
doResolve@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:3493:25
Promise@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:3352:14
callInvokeWithMethodAndArg@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:30661:33
enqueue@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:30666:157
http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:30683:69
_logMeIn@http://localhost:8081/forum/LoginForum.bundle?platform=ios&dev=true&minify=false&modulesOnly=true&runModule=false&shallow=true:59:42
onPress@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:57595:34
_performTransitionSideEffects@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:57151:22
_receiveSignal@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:57089:45
onResponderRelease@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:57007:34
invokeGuardedCallbackImpl@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:12754:21
invokeGuardedCallback@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:12848:42
invokeGuardedCallbackAndCatchFirstError@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:12852:36
executeDispatch@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:12957:48
executeDispatchesInOrder@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:12977:26
executeDispatchesAndRelease@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:13078:35
forEach@[native code]
forEachAccumulated@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:13068:22
runEventsInBatch@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:13102:27
runExtractedPluginEventsInBatch@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:13186:25
http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:14226:42
batchedUpdates$1@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:26457:20
batchedUpdates@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:14164:36
_receiveRootNodeIDEvent@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:14225:23
receiveTouches@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:14255:34
__callFunction@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:2755:49
http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:2477:31
__guard@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:2709:15
callFunctionReturnFlushedQueue@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:2476:21
callFunctionReturnFlushedQueue@[native code]