Fatal error after update piwik (2 replies)

Warning: session_write_close() [<a href='function.session-write-close'>function.session-write-close</a>]: write failed: Disk quota exceeded (122) in /var/www/web688/html/piwik/libs/Zend/Session.php on line 691

Backtrace -->

#0 Piwik_ErrorHandler(...) called at [:]
#1 session_write_close(...) called at [/var/www/web688/html/piwik/libs/Zend/Session.php:691]
#2 Zend_Session::writeClose(...) called at [:]


Warning: session_write_close() [<a href='function.session-write-close'>function.session-write-close</a>]: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/www/web688/html/piwik/tmp/sessions) in /var/www/web688/html/piwik/libs/Zend/Session.php on line 691

Backtrace -->

#0 Piwik_ErrorHandler(...) called at [:]
#1 session_write_close(...) called at [/var/www/web688/html/piwik/libs/Zend/Session.php:691]
#2 Zend_Session::writeClose(...) called at [:]