There was a project developed in Unity 4.5. I successfully updated it to Unity 2018.2.3f1 version without any error. Runs perfectly in Editor. When I create an APK (internal). I just get this screen when I open it on a mobile.
But when I make a Windows/Mac Build, it runs perfectly. I've also tried on another Editor (version 2017.3.x) and APK built from this is also good. I've re-installed Unity, nothing... Also updated the SDK but still a problem.
Some other projects' APK is built successfully with the scenes and everything but they also have some strange problems. Note: I cannot shift back to 2017.3.x. Is it a problem the latest Editor? OR Is it a problem with my machine? What possibly could that be?