Why does this not even print "1"?

The script is not disabled and no errors appear, very odd. code:

local fram = script.Parent.back
local num = 1

game.Players.PlayerAdded:connect(function(plr)
	print("1")
    for _,v in pairs(plr:WaitForChild("Inventory"):GetChildren()) do
	print("2")
        local item = Instance.new("ImageButton", fram)
        item.BackgroundTransparency = 1
        item.Name = "item"..tostring(num)
        item.Size = UDim2.new(.02, 0, .6, 0)
		local ex = item.Name:sub(4)
        item.Position = UDim2.new(tonumber(ex / 50), 0, 0.15, 0)
        item.Image = "rbxassetid://"..tostring(v.itemPrev.Value)
        item.ZIndex = 2
		num = num + 1
    end
end)