Warning: usort() expects parameter 2 to be a valid callback

  • Having trouble sorting out the meaning of this code:

    Warning: usort() expects parameter 2 to be a valid callback, class ‘Zolo_Instagram_Info_Widget’ does not have a method ‘sort_popularity_DESC’ in /home1/njloanse/public_html/besthombre/wp-content/themes/blogera/widgets/zt_widget_instagram.php on line 405

    Can anyone help explain the problem and/or troubleshoot it?

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

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