Hi. I keep getting the error " attempt to call upvalue 'raritys' (a table value)"?

If anyone can help i'd be very grateful. :)

local raritys = {
	Common = 5,
	Uncommon = 3,
	Rare = 1,
	Legendary = 0.2
}
local crateInUse = true

local function openCrate(chance)
	if crateInUse == true then
	 local items = {}
	 local result 
	 local frametimes = math.random(20,30)
	 for _,Item in pairs(game.ReplicatedStorage.Items:GetChildren()) do
		local rarNumber = raritys(Item.Rarity.Value)
		local times = math.max(rarNumber/chance)
	    end
	math.randomseed(tick())
	
	for num = 1,frametimes+5 do
		local item = items[math.random(#items)]
		local newicon = script.Parent.Unboxing.Inner.Icon:Clone()
		newicon.Visible = true
		newicon.Parent = script.Parent.Unboxing.Inner
		newicon.Image = item.ImageID.Value
		newicon.Position = UDim2.new(0,100*(num-1),0,0)
		if num == frametimes then
			result = item
			crateInUse = false
		end
		
	end
	end
end


script.Parent.TextButton.MouseButton1Click:Connect(openCrate(2))

When you have a table, you should index it using []s. When you have a function, you should call it using ().

abnotaddable is correct; the fix is to have local rarNumber = raritys[Item.Rarity.Value] on line 15.

Also, only use math.randomseed once at the top of the script and use up the first math.random() without using its value: math.randomseed(tick()); math.random(). The first random number is rarely different for mildly different seeds.