Error: Java exception was raised during method invocation

private void downLoadGame(String AppGameJsonStr) {
        L.e("AppGameJsonStr", AppGameJsonStr);
       mContext.runOnUiThread(new Runnable() {
           @Override
           public void run() {
               getPermissions().request(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE)
                       .observeOn(AndroidSchedulers.mainThread())
                       .subscribe(new Consumer<Boolean>() {
                           @Override
                           public void accept(Boolean aBoolean) throws Exception {
                               if (aBoolean) {
                                   
                               }
                           }
                       });
           }
       });
    }