Google Cardboard sdk not working

Hello!
I’ve followed this guide

to export the demo scene to my Samsung Galaxy S4 Mini, but I get only a totally black scene on my phone (I only can see the white line in the middle, to position the phone in the center of the Cardboard).

I’ve followed EXACTLY every step, choosing “Cardboard” as Virtual Reality SDK,
so I really can’t understand what’s going wrong…
Does someone could give me any advice?

Unfortunately I can’t see any contact to get help on Google sdk for Unity…

Many thanks!
Daniele

Try searching the gvr git issues page, I’m sure this has come up before

Also more info could help gvr version, unity version, rendering api (GLES 2.0/3.0) etc… try give as much info as possible. Screenshots of your scene hierarchy could help to

also adb logcat logs would help, it might be an android manifest problem.