title: EISDIR: illegal operation on a directory, read in React Native file system
body: <p>I'm trying simple code to copy a file to another external folder using this code:</p>
  
  <pre><code>RNFS.copyFile(sourcePath, destinationPath)
  .then(result =&gt; {
    console.log('file copied:', result);
  })
  .catch(err =&gt; {
    console.log('error: ', err.message, err.code);
  });
  </code></pre>
  
  <p>and i have already granted <code>Android.Permission</code> for read and write in external directory but it's still returning this error:</p>
  
  <pre><code>error:  EISDIR: illegal operation on a directory, read '/storage/emulated/0/' EISDIR
  </code></pre>
  
  <p>here are the dependency:</p>
  
  <pre><code>"react": "16.9.0",
  "react-native": "0.61.2",
  "react-native-fs": "^2.15.2"
  </code></pre>
  
  <p>BTW Am i request correct permission ?</p>
  
  <pre><code>PermissionsAndroid.PERMISSIONS.READ_EXTERNAL_STORAGE 
  PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE
  </code></pre>
  
  <p>Thanks for help in advance</p>