Radiation : ERROR: Inner/Outer surface_sets in shell surface not found

Hi Team,

I am getting following error while runing the Radiation in SimLab with AcuSlove Solver.

acuPrep: Processing FWH_OUTPUT
acuPrep: Processing VAO_OUTPUT
acuPrep: Processing AUTO_WALL
acuPrep: *** WARNING: surface_set "Surface_1174950_PC01-CMC_tet_tria3" is a mixed internal/external set
acuPrep: *** WARNING: surface_set "Surface_1175430_AIR-6_tet_tria3" is a mixed internal/external set
acuPrep: *** ERROR: Inner/Outer surface_sets in shell surface not found
acuRun: *** ERROR: error occurred executing acuPrep
acuRun: Wed Jun 12 00:11:54 2024