Material error

[StefanC19]

I made a grass model which I would like to use, it uses an alpha map but either the alpha map doesn't work or the whole thing is invisable. and now I am getting this error when in ep2:

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Material props_stefanc/grass_01 does not support vertex format used by the mesh (maybe missing fields or mismatched vertex compression?), mesh will not be rendered. Grab a programmer!


.VMT:

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"VertexLitGeneric"
{
   "$alphaTest" 1
   "$model" "1"
   "$baseTexture" "props_stefanc/grass_01"
}


I already tried using "$translucent" 1 and "LightmappedGeneric"
Purple is the grass, rest is landscape and water:
http://img269.imageshack.us/img269/2947/grasstest.jpg