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.