title: Users cannot update/install my app from Google Play(error -505)!
body: <p>I uploaded an update to Google Play and it seems many people cannot update or reinstall. When they try to update, they get error something with number <code>4</code>, if they try to clean install it, they get error <code>-505</code>. I just tried it on emulator and it worked fine, what the heck? Many people report an error. What is wrong?</p>