It seems i cannot set the image of an image button using a script, any ideas?

So this is what i tried, however it doesn't work, is there a particular reason it doesn't work or is this just a roblox thing? t1,t2 and t3 are decal IDs. This is my attempt at doing this.

local ev = workspace.MapVotingEvents.GuiE

ev.OnClientEvent:Connect(function(t1,t2,t3)
	
	
	local gui = script.Parent.Parent
	
	
		gui.Frame.map1.Image = "rbxassetid://" .. t1
		
		gui.Frame.map2.Image = "rbxassetid://" .. t2
		
		gui.Frame.map3.Image = "rbxassetid://" .. t3
	
	
	
	
end)