Cannot add custom models to pointshop market

[supersilent]

i know how the script is working but some how the model wont show up on the pointshop.
I have a xenon server host and also has the model pack at Addons and also at Materials and Models folder.

Eks:
ITEM.Name = 'Ironman'
ITEM.Price = 20000
ITEM.Model = 'models/player/Ironman/Ironman.mdl'

function ITEM:OnEquip(ply, modifications)
if not ply._OldModel then
ply._OldModel = ply:GetModel()
end

timer.Simple(1, function() ply:SetModel(self.Model) end)
end

function ITEM:OnHolster(ply)
if ply._OldModel then
ply:SetModel(ply._OldModel)
end
end

result is:
[IMG]https://lh4.googleusercontent.com/-UC9Cx0BR4Nw/UO8_y8gfYOI/AAAAAAAAABg/g8nD8eCkRNA/w1300-h731-no/2013-01-10_00002.jpg[/IMG]

Some models is an error, some models cannot be bought and some models doesn't make any movement will walking.

Im sorry if this is the wrong section but i don't see how it could be because i need help.