Help Decompiling HL2 SMG model - Unable to load model

[overki11]

Hello, I am working on a small SWEP pack for gmod, and I am getting to the point of making the SWEPS where you need to decompile the model, and the HL2 SMG in order to fix crotchguns and all that, but I use 2 model decompilers, and one of them crashes when I try to decompile the SWEP, and the other says "Unable to load model.". I can decompile the AR2 fine, but I can't get my model to work for some reason when I use the AR2. If someone has a fix, please post it here. I can decompile every other model fine, it seems that I just can't decompile w_smg1.mdl.