Why does this event only get called in studio and not in the game?

--Here's the local script which is in a gui button

player = game.Players.LocalPlayer
button = script.Parent

clicksleft = 5
button.MouseButton1Down:Connect(function()
	if clicksleft == 5 then
		clicksleft = clicksleft - 1
		button.Events.melee:FireServer()
		script.Parent.Text = "Click for a random staff"		
		print (clicksleft .. script.Parent.Text)
	end
end)

--This is the server script which is inside the gui button also

Melee = {}
for i,v in pairs (weapons.Melee:GetChildren()) do
	table.insert(Melee, v.Name)
end 

melee.OnServerEvent:Connect(function(plr)
	print("test")
	math.randomseed(tick())
	local chosen = math.random(1, #Melee)
	for i,v in pairs(weapons.Melee:GetChildren()) do
		if v.Name == (Melee[chosen]) then
			local clone = v:Clone()
			clone.Parent = plr.Backpack
		else
		end
	end
end)

This all works perfectly in studio, but when I play the game, it doesn't work. It prints the stuff from the local script but doesn't even print "test" from the server script.