explode() expects parameter 2 to be string

  • Hi all,
    I am trying to migrate a course following @us0906 instructions.
    I modified /wp-content/plugins/course-migration-for-learndash/admin/js/sfwd-lms-course-migration-admin.js
    I added to the Wordfence whitelist and cleared the cache.
    Apparently, the course was exported with no errors.
    Nevertheless, the course presented errors in my destination URL, and I got the following message:

    explode() expects parameter 2 to be string, array given in mydomain.com/wp-admin/includes/post.php on line 1603

    What I found on that line is:
    // Primitive capabilities used outside of map_meta_cap():

    Any idea what could be the error?
    Thanks
    Ricardo

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