I had same problem but I found the difference between the video and my material
He is using TextureSampleParameter"Cube"
and I’m using TextureSampleParameter"2D"
So if you use TextureSampleParameter"Cube" and plug into “XYZ”
I think the Error can be solved
(but if I do this, I can’t use HDR image… can I use HDR instead of Cube Texture?)