Why do i get attempt to compare number with string error?

So i made a Coffee Shop and did all i could. I made also this script and it always shows me this error... Here is my script :

Coffee = 2

script.Parent.ClickDetector.MouseClick:Connect(function(player)
	if player:FindFirstChild("leaderstats") then
		-- We know that the player has leaderstats
		if player.leaderstats.Cash.Value >= Coffee then
			player.leaderstats.Cash.Value = player.leaderstats.Cash.Value - Coffee	
			script.Parent.Parent.sadle.BrickColor = BrickColor.Random()
			local copy = game.ServerStorage.Coffee:Clone()
    		copy.Parent = game.Players.LocalPlayer.Backpack

	    end
	  end	
    end)

The error says its on line 6. So this one : if player.leaderstats.Cash.Value >= Coffee then .. Help me please