I use a plugin called theme my login. I had the developer of another plugin do some trouble shooting on his plugin and he installed phpmyadmin. After he was done I noticed he had deactivated theme my login, I opened the phpmyadmin to see what it is and found this error; Fatal error: Call to a member function add_query_var() on a non-object in /home/public_html/wp-content/plugins/theme-my-login/includes/class-theme-my-login.php on line 178
Upon activation thememylogin works fine however. Even after uninstalling thememylogin I still get this error.