AYUDA!!! fuction.require

Hola!!! Ayer actualicé el tema de theron lite, me dijo que era un error, y me cometió este error… y ahora no puedo acceder ni a la página ni al escritorio de wordpress…

Warning: require(/home/content/24/9501624/html/centrodelaimagen/wp-includes/session.php) [function.require]: failed to open stream: No such file or directory in/home/content/24/9501624/html/centrodelaimagen/wp-settings.php on line 122

Fatal error: require() [function.require]: Failed opening required ‘/home/content/24/9501624/html/centrodelaimagen/wp-includes/session.php’ (include_path=’.:/usr/local/php5_3/lib/php’) in/home/content/24/9501624/html/centrodelaimagen/wp-settings.php on line 122