Build Lighting failing

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Logs from the swarm agent ^^^

I’ve tried every solution I can find in other questions - including cleaning and validating the swarm cache. I actually just gave up trying to use static lighting and made every single light dynamic and rebuilt and still got this error… making me think the issue is actually elsewhere and not in my scene at all

Any ideas?!

Actually, I tried a new level with 1 cube, 1 lightmass importance volume and one static light, it built the lighting just fine. So it must be my scene… Not sure what’s wrong with it though.