title: undefined is not an object (evaluating 'data.length')
body: <p>I am very new to react-native. I just made a small app. And I wanted to add some images as introduction of app.
  So I added 'react-native-app-intro-slider' module.
  Then I got the following error.</p>
  
  <blockquote>
    <p>undefined is not an object (evaluating 'data.length')</p>
  </blockquote>
  
  <p>That is my <code>app.js</code>. I am not sure what the problem is.</p>
  
  <pre><code>import React, { Component } from 'react';
  import { StyleSheet, View, Text, Image } from 'react-native';
  import AppIntroSlider from 'react-native-app-intro-slider';
  
  const slides = [
    {
      key: 's1',
      text: 'Best Recharge offers',
      title: 'Mobile Recharge',
      image: require('./intro/(1).jpg'),
      backgroundColor: '#20d2bb',
    },
    {
      key: 's2',
      title: 'Flight Booking',
      text: 'Upto 25% off on Domestic Flights',
      image: require('./intro/(2).jpg'),
      backgroundColor: '#febe29',
    },
    {
      key: 's3',
      title: 'Great Offers',
      text: 'Enjoy Great offers on our all services',
      image: require('./intro/(3).jpg'),
      backgroundColor: '#22bcb5',
    },
  ];
  
  export default class App extends Component {
    constructor(props) {
      super(props);
      this.state = {
        showRealApp: false,
      };
    }
    _renderNextButton = () =&gt; {
    };
    _renderDoneButton = () =&gt; {
    };
    _onDone = () =&gt; {
      this.setState({ showRealApp: true });
    };
    _onSkip = () =&gt; {
      this.setState({ showRealApp: true });
    };
    _renderItem = ({ item }) =&gt; {
    };
  
    render() {
      if (this.state.showRealApp) {
        return (
          &lt;View&gt;
            &lt;Text&gt;aaaaa&lt;/Text&gt;
          &lt;/View&gt;
        );
      } else {
        return (
          &lt;AppIntroSlider
            slides={slides}
            renderItem={this._renderItem}
            onDone={this._onDone}
            showSkipButton={true}
            onSkip={this._onSkip}
            renderDoneButton={this._renderDoneButton}
            renderNextButton={this._renderNextButton}
          /&gt;
        );
      }
    }
  }
  </code></pre>
  
  <p>How to fix this error? Please help me.</p>