I agree all, this is highly annoying and just ran into it. On update, Learnpress should not give this message. Only on new installs.
I deactivated all add on plugins and still getting error. This is in Elementor, not the pro version because I deactivated that one, too.
I just ran into this problem, too. I deactivated NitroPack and site works fine now.
But I am doing a popup subscription form, not a widget.