Hi
That error are seem every minute at /home/user/logs/roundcube/errors_log, for your information, previously this server installed with 'Calendar and Contact' plugins, since that user reporting of error when do attachment, i try to uninstall the plugins and that doesnt solve the problem, just now i reinstall back the plugins but the different problem happen, after login the email and password, the page only show never ending Login successful, Redirecting. So i uninstall again the plugins and now webmail can login again but the problem of Server Error! (error) are still occured, so i suspect the issue are related with database and the Calendar and Contact plugins
Headache and i'm helpless