Kohana genereerde deze foutboodschap:

Fatal error: Uncaught exception 'ErrorException' with message 'Unknown: open(/var/lib/php/session/sess_622l29oj5hrrcd905n8h3jisi7, O_RDWR) failed: Permission denied (13)' in Unknown:0 Stack trace: #0 [internal function]: Kohana_Core::error_handler(2, 'Unknown: open(/...', 'Unknown', 0, Array) #1 {main} thrown in Unknown on line 0

Controleer de privileges en rechten.

chown apache:psacln /var/lib/php/session/
chmod 770 /var/lib/php/session/