David Franklin

I was also following the same tutorial. I also hit the same problem at 28:15. I was using Houdini Indie 15.5.632, as that's the last version that is currently supported by C4D to work with the Houdini to C4D pipeline.

When I switched to Houdini Indie 16.0.584 and retraced my steps, the smoke object now works.

Not sure what the problem was in 15, so I'm not sure I so much “solved” the problem as sidestepped it.