new to VR - have a problem

Taking my first try at modifying a scene to view thru Oculus Rift, I added what I think is the necessary code; however while I see a stereo image in the resulting app on my browser, when I try to view the scene thru my Rift I get a frozen hourglass, blackness, sometimes a broken image, or I get kicked back to the starting VR room. Any idea what I've done wrong?

Any ideas? Is it possible I need code beyond that to enable HMD?

Take a look at this message, please