Trails in Pointshop not working

[LoneZ]

I'm trying to use the workshop to upload my trails on. But when I load it in game the image works fine but when the trail is equipped. Nothing shows up.
I get this error though.

Unable to load sprite material materials/sprites/mudkips.vmt!

Here is my .lua inside the pointshop folder

ITEM.Name = 'Mudkips Trail'
ITEM.Price = 2000
ITEM.Material = 'mudkips.vmt'

function ITEM:OnEquip(ply, modifications)
	ply.TubeTrail = util.SpriteTrail(ply, 0, modifications.color, false, 15, 1, 4, 0.125, self.Material)
end

function ITEM:OnHolster(ply)
	SafeRemoveEntity(ply.TubeTrail)
end

function ITEM:Modify(modifications)
	PS:ShowColorChooser(self, modifications)
end

function ITEM:OnModify(ply, modifications)
	SafeRemoveEntity(ply.TubeTrail)
	self:OnEquip(ply, modifications)
end

My trails files are saved under /materials/mudkips.vmt and /materials/mudkips.vtf