Following a tutorial and the volume source works for them but not me. Any ideas why. I even tried to drop down a pyrosolver to see if that would help. No luck. See attached. Any help is appreciated.

So I got it sorted. Thought I'd post just in case anyone else runs into this. For the volumeSource node I just needed to change the Source Volume box to surface, since this is how the attribute was generated in the vdb. So was just a name issue. Also, worked for the pyrosolver node.