We just installed sugar. Everything seems to be ok except for one thing: when we click on the calendar tab we get this error-

Warning: main in /home/httpd/vhosts/crm.openbluenetworks.com/httpdocs/modules/Calendar/index.php on line 30

Warning: main in /home/httpd/vhosts/crm.openbluenetworks.com/httpdocs/modules/Calendar/index.php on line 30

Fatal error: main in /home/httpd/vhosts/crm.openbluenetworks.com/httpdocs/modules/Calendar/index.php on line 30

Can anyone help resolve this?

Thanks,

Robin.