page builder error / not loading

Hello,

Since a few hours ago I keep getting one of these errors every time I start loading a page to edit:
Failed to load plugin url: https://www.connix.nl/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/assets/js/avia-tinymce-buttons-4.js
Failed to load plugin url: https://www.connix.nl/wp-content/themes/enfold/config-layerslider/LayerSlider/static/admin/js/ls-admin-tinymce.js

The page editor was loading very slow before, and today it stopped working at all.
I have tries a clean enfold install and disabling all plugins as others suggested, but this did not work.
The files names in the error I replaced with those of a new install download, sadly this did not change anything.

Do you have any suggestions?

Thanks,
Tjeu