WP Related Posts plug-in

  • Help! I was adding the WP related posts plug-in to a friend’s site and got this message and now am not able to even access the dashboard. The site is still up but here’s what i get when i log into the admin page

    Fatal error: Call to undefined function is_site_admin() in /home/reddog/public_html/wealthyhealthywise.net/wp-content/plugins/wordpress-related-posts/related-posts.php on line 81

    Anyone know how to fix this?

    THX!

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