Error Pointshop

[DeadShotKillz]

im getting this error

[ERROR] addons/pointshop-master/lua/items/powerups/health.lua:1: attempt to index global 'ITEM' (a nil value)
1. unknown - addons/pointshop-master/lua/items/powerups/health.lua:1

Here is My code.

ITEM.Name = 'Health Kit'
ITEM.Price = 1000
ITEM.Model = 'models/items/healthkit.mdl'
ITEM.NoPreview = false

function ITEM:OnEquip(ply, modifications)
timer.Start( "Healthr" )

end

timer.Create( "Healthr", 4, 100, function()
ply:SetHealth( ply:Health() + 2 )

end)