创建React Native NPM包时出现iOS运行异常该如何解决？

我参照了一篇React Native原生模块开发的技术文章创建React Native库，发布后在本地项目中引入使用，Android端运行完全正常，但iOS端运行时抛出如下错误：

TypeError: null is not an object (evaluating '_exampleBridge.default.showMessage').

未捕获错误相关截图

我已经在Xcode13中打开该库项目，确认项目可成功构建，提前感谢各位的解答。

import React from 'react';
import { SafeAreaView, ScrollView, StatusBar, StyleSheet, Text, useColorScheme, View, Button } from 'react-native';
import {Colors,Header} from 'react-native/Libraries/NewAppScreen';
import RNExampleBridge from 'example-bridge-1.0.8'

const App = () => {
  const isDarkMode = useColorScheme() === 'dark';

  const backgroundStyle = {
    backgroundColor: isDarkMode ? Colors.darker : Colors.lighter,
  };

  function showToastAlert(){
    RNExampleBridge.showMessage()
  }

  return (
    <SafeAreaView style={backgroundStyle}>
      <StatusBar barStyle={isDarkMode ? 'light-content' : 'dark-content'} />
      <ScrollView
        contentInsetAdjustmentBehavior="automatic"
        style={backgroundStyle}>
        <Header />
        <View
          style={{
            backgroundColor: isDarkMode ? Colors.black : Colors.white,
          }}>
          <View>
            <Button title="Show Native Message" onPress={() => { showToastAlert() }}/>
          </View>
        </View>
      </ScrollView>
    </SafeAreaView>
  );
};

export default App;

内容的提问来源于stack exchange，提问作者Ajay Pillai