Model not showing when playing Half-Life 2

[gruntkiller4000]

I am currently making my own mod. I have recently been working on a custom model. Everything is fine when I import it into hammer but when I play my map the model doesn't appear! I used Milkshape 3D to make my model, and used Cannonfodders Studio Compiler to compile my model. On the model GUI in Hammer, the model shows up perfectly with the texture and so as on the Model Viewer. I have the SourceSDK. I really need some help please!