Had the same error last week.
Everything in my scene was modeled by me or used from Evermotion or CGAxis.
One model was from 3dsky and had some splines as well that were from the floor plan.
Deleted the 3dsky model and it started working. Had to remodel that sofa.
If you have anything downloaded from the internet try removing it and see how it goes.
Also try cleaning and validating swarm cache after you remove the rogue asset.