Surfaceprop error?

I’m currently making a gmod playermodel in blender and whenever I try to compile, it tells me that the bodygroup option surfaceprop is unknown

my script:
// Created by Crowbar 0.36.0.0

$ModelName “TSCGCobra043_pm_test.mdl”

$BodyGroup “tscgcobra043.smd”

$SurfaceProp “flesh”

$Contents “solid”

$MaxEyeDeflection 90

$CDMaterials “models\re_rc\skins”

$CBox 0 0 0 0 0 0

$BBox -10.636 -28.501 -0.075 10.807 28.531 71.495

$Sequence “idle” "anims\idle{
fps 30
“ACT_DIERAGDOLL” 1
}

$includemodel “m_anm.mdl”

$CollisionJoints “personal_spartan_physics.smd”
{
$mass 80
$inertia 5
$damping 0.01
$rotdamping 1.5
$rootbone “valvebiped.bip01_pelvis”

$jointconstrain "b_l_thigh" x limit -66 97 0
$jointconstrain "b_l_thigh" y limit -46 46 0
$jointconstrain "b_l_thigh" z limit -48 21 0

$jointconstrain "b_l_calf" x limit -117 3 0
$jointconstrain "b_l_calf" y limit -21 21 0
$jointconstrain "b_l_calf" z limit -12 12 0

$jointconstrain "b_r_thigh" x limit -66 97 0
$jointconstrain "b_r_thigh" y limit -46 46 0
$jointconstrain "b_r_thigh" z limit -46 21 0

$jointconstrain "b_r_calf" x limit -117 3 0
$jointconstrain "b_r_calf" y limit -21 21 0
$jointconstrain "b_r_calf" z limit -12 12 0

$jointconstrain "b_r_foot" x limit -57 57 0
$jointconstrain "b_r_foot" y limit -23 23 0
$jointconstrain "b_r_foot" z limit -53 53 0

$jointconstrain "b_spine2" x limit -61 37 0
$jointconstrain "b_spine2" y limit -64 64 0
$jointconstrain "b_spine2" z limit -30 30 0

$jointconstrain "b_l_upperarm" x limit -68 68 0
$jointconstrain "b_l_upperarm" y limit -55 55 0
$jointconstrain "b_l_upperarm" z limit -37 46 0

$jointconstrain "b_l_forearm" x limit -26 86 0
$jointconstrain "b_l_forearm" y limit -30 30 0
$jointconstrain "b_l_forearm" z limit -8 8 0

$jointconstrain "b_head" x limit -37 46 0
$jointconstrain "b_head" y limit -91 91 0
$jointconstrain "b_head" z limit -41 41 0

$jointconstrain "b_r_upperarm" x limit -68 68 0
$jointconstrain "b_r_upperarm" y limit -55 55 0
$jointconstrain "b_r_upperarm" z limit -41 46 0

$jointconstrain "b_r_forearm" x limit -26 86 0
$jointconstrain "b_r_forearm" y limit -30 30 0
$jointconstrain "b_r_forearm" z limit -8 8 0

$jointconstrain "ValveBiped.Bip01_R_Hand" x limit -55 55 0
$jointconstrain "ValveBiped.Bip01_R_Hand" y limit -108 146 0
$jointconstrain "ValveBiped.Bip01_R_Hand" z limit -82 46 0

$jointconstrain "ValveBiped.Bip01_L_Hand" x limit -55 55 0
$jointconstrain "ValveBiped.Bip01_L_Hand" y limit -108 146 0
$jointconstrain "ValveBiped.Bip01_L_Hand" z limit -82 46 0

$jointconstrain "b_l_foot" x limit -57 57 0
$jointconstrain "b_l_foot" y limit -23 23 0
$jointconstrain "b_l_foot" z limit -53 53 0

}

the bodygroup’s name is missing.