Saying Buttons isnt a Valid member of ScreenGui?

I really dont know why TBH because it obviously is.

for i,v in pairs(script.Parent.Buttons:GetChildren()) do
	if v:isA("TextButton") then
		v.MouseButton1Click:connect(function()
			pcall(function()
				if v:FindFirstChild("Pass") then
					game.MarketplaceService:PromptPurchase(game.Players.LocalPlayer,tonumber(v.Name))
				else	
					game.MarketplaceService:PromptProductPurchase(game.Players.LocalPlayer,tonumber(v.Name))
				end
			end)
		end)
	end
end

Location: https://gyazo.com/edb8f8fc8e2a1c4ca9fc966d13ea26be

script.Parent:WaitForChild("Buttons")
for i,v in pairs(script.Parent.Buttons:GetChildren()) do
    if v:isA("TextButton") then
        v.MouseButton1Click:connect(function()
            pcall(function()
                if v:FindFirstChild("Pass") then
                    game.MarketplaceService:PromptPurchase(game.Players.LocalPlayer,tonumber(v.Name))
                else    
                    game.MarketplaceService:PromptProductPurchase(game.Players.LocalPlayer,tonumber(v.Name))
                end
            end)
        end)
    end
end