Fix an error on a native Android mobile app (native)

I am having a minor issue with my Android application (native). Used to work fine until a few days ago, I just couldn't login to the app successfully again. When I try to login, I get the error message: "there is something wrong".

I am looking for an experienced Mobile developer to have a look and fix ASAP. Please be ready to start now and fix immediately. I do not think this is much of task for the right talent.

Finally, please no bogus bids. If you are looking to win the bid just to outsource again, please do not bother.