problems with plugin.min.js

Whenever I want to edit a page in WordPress, an error of this kind comes up.

Oddly enough, always in relation to rich-event-timeline

Failed to load plugin: wordpress from url https://www.my-page.de/wp-content/plugins/rich-event-timeline/Scripts/plugins/wordpress/plugin.min.js

Failed to load plugin: wpautoresize from url https://www.my-page.de/wp-content/plugins/rich-event-timeline/Scripts/plugins/wpautoresize/plugin.min.js

Failed to load plugin: wpemoji from url https://www.my-page.de/wp-content/plugins/rich-event-timeline/Scripts/plugins/wpemoji/plugin.min.js

What could be the reason for this?