Keypress Event not working... What is my error? (updated)

My old question was answered but it still wouldn't work. The script the person who answered my question gave me had some errors so I changed it but now I "Attempted to call a nil value." Can anyone point out what my error was please? Please check the script below. Thank you for your time.

Script:

    local userInputService = game:GetService("UserInputService")
    local Inventory = script.Parent:GetChildren("Inventory")

    userInputService.InputBegan:Connect(function(input)
        if input.KeyCode == Enum.KeyCode.E then
            Inventory.Visible = true
            Inventory:TweenPosition{
            UDim2.new(0.068, 0, 0.077, 0), 
            Enum.EasingDirection.Out,
            Enum.EasingStyle.Quad,
            0.5,
            false
        }
    end
end)