Error in WP backend: Accordion-Menus not working

  • Hi,
    I recently discoverd that the Plugin Clever Mega Menu produces an error in the backend of WordPress. I think it first appeared after the WordPress update to V 5.5.
    The Mega menu works on the frontend but the error obviously blocks something on the backend.
    Error:
    Uncaught ReferenceError: cleverMenuI18n is not defined
    at HTMLDocument.<anonymous> (clever-mega-menu-admin.min.js?ver=1.0.9:1)
    at i (load-scripts.php?c=0&load[chunk_0]=jquery,utils&ver=5.5:2)
    at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[chunk_0]=jquery,utils&ver=5.5:2)
    at Function.ready (load-scripts.php?c=0&load[chunk_0]=jquery,utils&ver=5.5:2)
    at HTMLDocument.J (load-scripts.php?c=0&load[chunk_0]=jquery,utils&ver=5.5:2)

    Because of this error all accordion menus within WP-dashboard-design-menus (add pages, posts, categories… to a menu) of the WP backend doesn’t work enymore. Thus it is not possible to add pages/categories/posts… to a menu.
    This error seems to affect even more pull down menus/pop up options in the WP-backend. For instance I can not edit the options of a hyperlink in a post.
    Can you help?
    Thanks.
    Martin

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

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