( ! ) Warning: mkdir(): No space left on device in /var/www/ViewOffice/class/Sistema/Session.php on line 0

( ! ) Warning: fileowner(): stat failed for /var/lib/php5/sessions/ViewOffice/ViewOffice in /var/www/ViewOffice/class/Sistema/Session.php on line 0

Unhandled Exception: No se puede escribir en /var/lib/php5/sessions/ViewOffice/ViewOffice. El propietario de esta carpeta es el usuario root. Asegúrate que que el propietario de la carpeta /var/lib/php5/sessions es el usuario de Apache (ej. www-data). Puedes cambiarlo, por ejemplo, con la instrucción:

chown -R www-data. /var/lib/php5/sessions

Backtrace:
# 0 /var/www/ViewOffice/class/Sistema/Session.php(0): ICS_Sistema_Session->__construct()
# 1 /var/www/ViewOffice/sistema.php(0): ICS_Sistema_Session::getObjeto()
# 2 /var/www/ViewOffice/index2.html(0): unknown()
# 3 {main}

( ! ) Warning: Cannot modify header information - headers already sent by (output started at /var/www/ViewOffice/class/Sistema/Session.php:0) in /var/www/ViewOffice/class/Sistema/Session.php on line 0

( ! ) Warning: mkdir(): No space left on device in /var/www/ViewOffice/class/Sistema/Session.php on line 0

( ! ) Warning: fileowner(): stat failed for /var/lib/php5/sessions/ViewOffice/ViewOffice/ViewOffice in /var/www/ViewOffice/class/Sistema/Session.php on line 0

( ! ) Fatal error: in /var/www/ViewOffice/class/Sistema/Session.php on line 0
( ! ) Exception: in /var/www/ViewOffice/class/Sistema/Session.php on line 0