SFM phong Problems

I've recently been playing around with override materials in sfm, and trying to learn some new things. I was trying out $phong and $phongboost on models, when I found that some models couldn't have phongboost. I opened their VMT files in the materials folder in hopes of solving the problem, but I couldn't figure anything out. Here's how the code basically was for one of the models:

PHP Code:

---

"VertexlitGeneric"
{
    "$basetexture" "models/example"
    "$bumpmap" "models/example_bumpmap"
    "$surfaceprop" "Default"
} 


---

The texture file is DXT1, and I was adding it under float. Thanks in advance.

P.S. I could still use a little help understanding what all the attributes mean, Like bool and int, and a list of all of the tag/modifier things I can use in them.

SFM phong Problems