Ah - i clicked start and it created the basic blocks. It looks like they are convexDecompositions on my end though - and I don’t see your error with meshSimplification.
I wonder if this is because I’m running Isaac Sim 2022.2.1 and you seem to have 2022.2.0? Let me know if you think that’s the issue and I’ll download the older one and try to repro.