Hi. So i wanted to try and learn more about metatables

I have a lot of buttons. What i want to do is to change background color to black when I hover over them.

I put all the buttons in a table and I wanted to use metatable to change the backgrounds.

Instead, i get an error saying

attempt to index field 'MouseEnter' (a nil value)

Why is that? here is my code.

[Updated]' So it doesn't error now but it still does not change background. I also noticed that the print in the metatable does not print.....

PlayGuiPrecedences[1] = PlayGui:WaitForChild("Container");
			PlayGuiPrecedences[2] = PlayGuiPrecedences[1]:WaitForChild("Play");
			PlayGuiPrecedences[3] = PlayGuiPrecedences[1]:WaitForChild("Settings");
			PlayGuiPrecedences[4] = PlayGuiPrecedences[1]:WaitForChild("");
			PlayGuiPrecedences[5] = PlayGuiPrecedences[1]:WaitForChild("MainMenu");	

local ChangeBackgroundWhenHover = {
			__index = function(MouseEnterTable)
				MouseEnterTable.MouseEnter:Connect(function()
					print("Working?");
					MouseEnterTable.BackgroundColor3 = Color3New(0, 0, 0);
					wait();
				end);
			end;
		}
		
		 MouseEnterTable = setmetatable({
			PlayGuiPrecedences[2];
			PlayGuiPrecedences[3];
			PlayGuiPrecedences[4]
		}, ChangeBackgroundWhenHover)
		

help please. A helper in chat told me metatables in not necessary for this but i still want to know how to use metatables for situations lik this.