title: React Native Fetch Blob - undefined is not an object (evaluating 'RNFetchBlob.DocumentDir')
body: <h1>Disclaimer</h1>
  
  <p>I <strong>have</strong> looked at the trouble shooting page of the wiki, however I still cannot fix the problem I am having.</p>
  
  <h3>RN version:</h3>
  
  <pre><code>react-native-cli: 2.0.1
  react-native: 0.43.4
  </code></pre>
  
  <h1>My code:</h1>
  
  <p><code>import FileUploader from 'react-native-file-uploader'</code></p>
  
  <p>and</p>
  
  <pre><code>&lt;Button
      onPress={() =&gt; RNFetchBlob.fetch('POST', 'http://localhost:8000/upload', {
              'Content-Type' : 'application/octet-stream'
          }, RNFetchBlob.wrap('./tempImageStore/image.jpg'))
      }
      title={'Upload File'}
  /&gt;
  </code></pre>
  
  <h1>Error I am getting:</h1>
  
  <p><img src="https://cloud.githubusercontent.com/assets/13806068/25783660/f1ae39dc-3314-11e7-9ad8-487b0105bbbd.png" alt="simulator screen shot may 7 2017 11 04 09 am"></p>
  
  <h3>What I did to install <code>react-native-fetch-blob</code>:</h3>
  
  <p>1) <code>npm install --save github:wkh237/react-native-fetch-blob-package#master</code><br>
  2) <code>react-native link</code></p>
  
  <h1>Background info:</h1>
  
  <ul>
  <li>I have tried importing it with both <code>import RNFetchBlob from 'react-native-fetch-blob'</code> and <code>var RNFetchBlob = require('react-native-fetch-blob').default</code> </li>
  <li>I have tried installing it with the above code and also with <code>npm install --save react-native-fetch-blob</code></li>
  <li>I am trying this on the <strong>IOS</strong> emulator.</li>
  </ul>
  
  <p>Thank you in advance for your help!</p>