我正在创建一个React原生应用程序，在我的模拟器谷歌移动的广告（奖励测试广告）工作得很好.但当我在我的真实的设备上测试应用程序（个人手机）然后奖励广告不工作，它崩溃了应用程序，只有横幅广告在真实设备上工作.
有什么问题，可以请任何人回复与解决方案？谢谢你提前
下面是我用于奖励广告的代码

import React, { useState, useEffect } from "react";
import { View, Button, Text, ScrollView, } from 'react-native'
import { RewardedAd, RewardedAdEventType, TestIds } from 'react-native-google-mobile-ads';

const adUnitId = __DEV__ ? TestIds.REWARDED : 'ca-app-pub-3940256099942544/5224354917';

const rewarded = RewardedAd.createForAdRequest(adUnitId, {
  requestNonPersonalizedAdsOnly: true,
  keywords: ['fashion', 'clothing'],
});

const Testing = ({ navigation }) =>{
    const [loaded, setLoaded] = useState(false);

    useEffect(() => {
      const unsubscribeLoaded = rewarded.addAdEventListener(RewardedAdEventType.LOADED, () => {
        setLoaded(true);
        rewarded.show();
      });
      const unsubscribeEarned = rewarded.addAdEventListener(
        RewardedAdEventType.EARNED_REWARD,
        reward => {
          console.log('User earned reward of ', reward);
        },
      );
  
      // Start loading the rewarded ad straight away
      rewarded.load();
  
      // Unsubscribe from events on unmount
      return () => {
        unsubscribeLoaded();
        unsubscribeEarned();
      };
    }, []);
  
    return (
        <ScrollView>
        <View style={{flex:1, justifyContent : 'center',alignItems : 'center'}}>
        <Text> 
        Lorem Ipsum is simply dummy text of the printing and typesetting industry.
        Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,
         </Text>
        <Button onPress = {() => navigation.navigate('First')} title='Next Screen'></Button>
           </View>
        </ScrollView>
    )
    
    }
    export default Testing;

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