title: why will i get error react-native-image-picker : NativeModule.ImagePickerManager is null
body: <p>I have been on this issue for about 3days now and I have tried everything within my power. </p>
  
  <p>React Native gives me the error </p>
  
  <pre><code>react-native-image-picker : NativeModule.ImagePickermanger is Null. To fix this issue, try these steps;
  
  Run react-native link react-native-image-picker in the project root.
  
  Rebuild and re-run the App.
  </code></pre>
  
  <p>When I run react-native link react-native-image-picker, I get ; </p>
  
  <pre><code>info iOS module "react-native-image-picker" is already linked
  info Android module "react-native-image-picker" is already linked
  </code></pre>
  
  <p>When I rebuild with react-native</p>
  
  <pre><code> react-native run-android 
  </code></pre>
  
  <p>And re-run with </p>
  
  <pre><code>npm start ( as shown on the screen), 
  </code></pre>
  
  <p>It goes back to the original error. It is like a loop.</p>
  
  <p>I am using Andrioid Emulator Nexus 7 on Ubuntu 16.04</p>
  
  <p>secitons of code</p>
  
  <pre><code>import { ImagePicker } from 'react-native-image-picker';
  
   _pickImage = () =&gt; {
      const options = {
        noData: true,
        allowsEditing: true,
        mediaTypes: "mixed",
        quality: 0.5,
      };
      ImagePicker.launchImageLibrary(options, response =&gt; {
        if (response.uri) {
            let fileObj = {
            key: this.state.attachments.length, //first image will have 0 here
            fileInfo: response
          };
          this.state.attachments.push(fileObj);
          this.setState((prevState) =&gt; ({
            numFiles: parseInt(prevState.numFiles) + 1,
          }))
        }
      });
    };
  
  _pickLiveImage = () =&gt; {
      const options = {
        noData: true,
        allowsEditing: true,
        mediaTypes: "mixed",
        quality: 0.5,
      };
      ImagePicker.launchCamera(options, response =&gt; {
        if (response.uri) {
            let fileObj = {
            key: this.state.attachments.length, //first image will have 0 here
            fileInfo: response
          };
          this.state.attachments.push(fileObj);
          this.setState((prevState) =&gt; ({
            numFiles: parseInt(prevState.numFiles) + 1,
          }))
        }
      });
    };
  </code></pre>
  
  <p>Any help or propositions on this issue will be highly welcomed.</p>