I was receiving an error while trying to update to 3.9 and I read that one of the plugins may be causing the issue. I proceeded to deactivate and attempt to update but I received the same error. I went back to activate the plugins and now I'm getting this error:
Fatal error: Call to undefined function wp_register_plugin_realpath() in /home/content/71/7370971/html/wp-admin/plugins.php on line 150
What do I do?
Note: I am brand new to this site. I received responsibility for my company's site from the previous assistant and I've already screwed it up. :)