android-upload-service: Error During upload

hi, am trying to upload mp4 file from device storage but am keep geting error the code am using is

                UploadService.NAMESPACE = BuildConfig.APPLICATION_ID;

                final String uploadID = UUID.randomUUID().toString();
                final String serverUrlString = "http://xxyyzz.com/mmff/upload.php";

                try {

                    new MultipartUploadRequest(context, uploadID, serverUrlString)
                            .addFileToUpload(Environment.getExternalStorageDirectory().getAbsolutePath() + "/file2.mp4", "your-param-name")
                            .addHeader("your-custom-header-name", "your-custom-value")
                            .addParameter("your-param-name", "your-param-value")
                            .setNotificationConfig(new UploadNotificationConfig())
                            .setMaxRetries(2)
                            .startUpload();

                } catch (Exception exc) {
                    Log.e("AndroidUploadService", exc.getMessage(), exc);
                }