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ARVR with Unity 5.4.0f1 (64-bit) not working for Note4 Gear VR

Hi, I've followed the steps in https://library.vuforia.com/articles/Solution/Integrating-Gear-VR-and-the-AR-VR-Sample-in-Unity-5-3-and-above. The app starts, but I can only see a yellow button or circle, on a black background. I've started directly on Vuforia-3-AR-VR scene. I'm working with:

ARVR-6-2-10.unitypackage. 

Unity 5.4.0f1 (64-bit).

Samsung Gear VR with Samsung Note4. 

Am I missing something?