VDS Manager - Blank page after Installation

[layered]

Hi,
I installed VDSManager (trial) but when I go to https://xxx.xx.xxx.xx/manager/vdsmgr show a blank page.
What can I do to fix it?
Thanks

[vadim s. sabinich]

which OS?
tail /var/log/messages
tail /usr/local/ispmgr/var/vdsmgr.log
tail /var/log/httpd-logs/error.log