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assigned to @Pawan
@duyquang.tdm.bd I'm facing similar issues. I've found that only simple decomp (and maybe hierarchical decomp, I didn't test that as well as the manual ones) works, but not necessarily in all cases. Sometimes I get the error you have during meshing with snappyHexMesh only for a certain combination of decomp settings.
But in any case I wasn't able to run with metis / scotch / kahip.