Thanks JohnDoh,
After upgraded kolab_auth plugin,I was able to connect to roundcube.
But now I have some other problems. In the log I have :
DB Error: [1054] Unknown column 'changed' in 'field list'
or
PHP Error: Authenticate error (Status: 500) in /usr/share/roundcubemail/plugins/kolab_files/lib/kolab_files_engine.php on line 702
And I can't send mail. Did i miss something?