Hey All,
I’m getting render errors every time I try to build lighting. I have rendered before in this scene, and it was fine.
This is the error:
I am also getting this same crash since updating to 4.18
FYI, I was able to make this stop by clearing the cache in lightmass on all the swarm machines we were using. Not sure if that will help you or not. I also deleted a number of lightmass importance volumes and remade them, not totally sure which fixed the crash (if either).
Yup - Clearing the cache in the Swarm Agent worked for me.
Thanks for finding that one out 
how do you do that?
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