I originally tried to change the theme of our website, and received the same "fatal error" result. I am getting a similar result when trying to activate this plugin to adjust our snippet. What I am getting is: "Fatal error: Call to undefined function is_multisite() in /data/9/1/18/120/1833935/user/1989694/htdocs/wp-content/plugins/code-snippets/code-snippets.php on line 1135."
How do I resolve this?