failed to load resource, widget keeps loading

Hi,

I’m having trouble with my elementor. If I activate some plugins (ultimate members, user menus, wp mail stmp) it always shows this error: https://ibb.co/LS7khjK and the widget bar won’t load properly.

after deactive the plugins the widget loads normally with this warning: https://ibb.co/QCvmrQM

I did everything suggested here https://docs.elementor.com/article/576-elementor-widget-panel-not-loading but nothing works.

The page I need help with: [log in to see the link]