Application closed unexpectedly. don't know why, have tried everything....

Hello, i am new to VR, i am using unity 2019.1.2 and latest unity integration. have followed everything according to the tutorials provided but still when i run my apk and connect my device to vr gear it doesn't show a thing just the vr gear app launches. i am using note 5 and s8+ and only on s8+ it says application closed unexpectedly. Can anyone guide me what i am doing wrong?