Black screen appears on android mobile - AR application

I have build a AR android app with the help of unity and vuforia sdk. After installing the apk file on my android phone. Realtime camera is not showing on mobile but when i show the target its tracking the target. How to solve the problem

Same here… Updated everything.
Graphic APIs = OpenGLES2
AutoGraphics API = turned off
up to date Vuforia version

Unity 2019.1.3f1
The strange thing is, that it worked once and while updating the apk the screens stays black. And I didn’t change anything.

Regards

MotionBrain

Hi guys, has anyone got a solution to this problem? Kindly, let me know. Thanks