Detailsprites refuse to work

[Samuel2213]

I am trying to get detailsprites to work in TF2. I am trying to use the default detail_sawmill.vbsp and it is not working. The only one that seems to work is tf_grass.vbsp, which is odd as there is no file with such a name.
Does anyone have any idea how to fix it?
Here is my vmt

"WorldVertexTransition"
{
	"$basetexture" "Nature/dirtground010"
	"$basetexture2" "Swamp/nature/swampgrass002"
	"$blendmodulatetexture" "Nature/grass_blendmask"
	"%tooltexture" "Swamp/nature/swampgrass002-tooltexture"
	"%keywords" "tf"
                "%detailtype" "detail_sawmill"
	"$ssbump" "1"
	"$surfaceprop" "dirt"


}