ctab,4,fluid,17,1,4,,,,,off,,light ctname,4, vc3d,0,10,10,0,10,10,0,1,2 $cset all $plty,ehid $cplo save,star.mdl geom,star.geom,1,binary,check,serial,

when I finished the commands listed above, the error as following: error #11 undifined material type assigned to cells. error #126 cell definition points to an undefined porosity model.

if i use the default materials there will be no any errors. what's the problem?

If those commands completely define your model, then you have made two errors: your ctab command assigns cell type 4 to material number 4 and porosity index 1. Neither of these exist. Compare this the default fluid material, which has material number 1 (which exists) and porosity index 0 (which means none).