I just updated my blog to wordpress 2.8.4 (http://www.antoyoussef.com).
The blog's appearance is fine. But when I am on the "Dashboard" section and I want to edit or change themes in the "Appearance" section on the left (http://www.antoyoussef.com/wp-admin/themes.php), it takes me to an error page:
Error 500 - Internal server error
An internal server error has occured!
Please try again later.
Also, the Plugins section is not displaying completely.
Any help would be very appreciated. Thank you.