Tried to follow https://vimeo.com/146113972 [vimeo.com]
The idea is that the fuel coming out of the barrel hits the flame and catches fire, but the fuel just ignores the flame.
minute 26:40 he adds a source volume node, that's node that gives the error when I run the simulation.
I reset the simulation in the AutoDopNetwork, didn't help.
Any idea?

I think that error comes up when you're trying to run a sim while inside a SOP solver inside a dop network. Usually if you go back up a level to your dopnet and rerun the sim it solves that issue..