Uncaught TypeError: jQuery(…).sortable is not a function

  • When editing very long posts, the visual editor and buttons fail to load. Upon inspecting the site, the Chrome JS Console shows the following error:
    Uncaught TypeError: jQuery(…).sortable is not a function

    it links to this js file:
    /wp-content/plugins/multiple-sidebars/js/msjs.js

    error on line #41:
    jQuery(“#”+MS_id+” .inactivos, #”+MS_id+” .activos”).sortable({

    This doesn’t happen on all posts, only posts with a lot of text.

    Any idea how we can fix?

    https://www.ads-software.com/plugins/multiple-sidebars/

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