title: File uploading with ion
body: <p>I am trying to upload image file to my server with ion library.I am using following code</p>
  
  <pre><code>Ion.with(this, "upload_url")
                  .setMultipartFile("imagefile", "image/jpeg", new File("file:///storage/emulated/0/Pictures/MyCameraApp/IMG_19700101_000000.jpg"))
                  .asJsonObject()
                  .setCallback(new FutureCallback&lt;JsonObject&gt;() {
                         @Override
                          public void onCompleted(Exception e, JsonObject result) {
                              Log.w("ERROR",""+e);
                              Log.w("RESULT",""+result);
                          }
                      });
  </code></pre>
  
  <p>But I am getting:</p>
  
  <pre><code>11-18 19:09:08.465: W/ERROR(1435): com.google.gson.JsonParseException: unable to parse json
  </code></pre>
  
  <p>What is wrong with this code ? </p>