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Check the Arnold log for warnings about non-manifold geometry.
00:00:00 1456MB WARNING | [subdiv] Head_Level2:Group1Shape: edge (15040,59481) in face 60669 used more than twice (non manifold edge) 00:00:00 1456MB WARNING | [subdiv] Head_Level2:Group1Shape: incompatible polymesh topology, unable to subdivide
still I don"t know how to fix it. please help
if you can't do it manually ... try ... Modelling->Mesh->Cleanup->RemoveGeometry->NonmanifolfdGeometry