ERROR!! [error/error.phtml]

※以下のような問題が発生しました。 [errorAction]

Zend_Session::start() - /var/www/ZendFramework-1.11.7/library/Zend/Session.php(Line:480): Error #2 session_start(): open(/var/lib/php/session/sess_4u6m136tibve8urcgj4m7r8gt1, O_RDWR) failed: No space left on device (28) Array /var/www/ZendFramework-1.11.7/library/Zend/Session.php(Line:490): Error #2 session_write_close(): open(/var/lib/php/session/sess_4u6m136tibve8urcgj4m7r8gt1, O_RDWR) failed: No space left on device (28) Array /var/www/ZendFramework-1.11.7/library/Zend/Session.php(Line:490): Error #2 session_write_close(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/session) Array