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Application exit to home screen after launch

Hi,

I'm trying to create a simple AR Apps using Unity 5.1.3p3, Vuforia 5.0.10.

Everything when fine, i can build the android program and generate the .apk file without problem in the compiler. But everytime the program launch at my phone it just having a black screen for a moment, then back to the home screen. I've tried using the USB debugging mode to directly install the program to my phone but it just keep repeating the same thing.I don't know what causing this problem, i'm using the 4.0.3 API as minimum requirement in Android player settings when build. Is there any step that i missed or something? Thanks for reading my thread.