Problem with roundcube

[pgh2011]

Hi,

When I start roundcube I receive an error:

PHP Warning:  session_start(): Failed to read session data: user (path: /var/sentora/sessions) in /etc/sentora/panel/etc/apps/webmail/program/lib/Roundcube/rcube_session.php on line 108

PHP Fatal error:  Uncaught Error: Call to undefined method rcmail_output_html::common_headers() in /etc/sentora/panel/etc/apps/webmail/index.php:47

Any ideas?