Blank page if I activate mobile joomla plugin

UPDATE: The white page is the standard mobil template I choose w/o any module placed. I would expect this page if I open mobile.3ecke11er.de.

Did I configure something wrong?

I installed mobile jomla to my joomla 1.5 framework but when I activated the mobile joomla plug in I see a white page on my www page.

I use the multisite configuration. Do you need more information?

Regards
Erik

What do you mean by "multisite configuration"?
What PHP version do you use?
Do you have error messages in servers error_log file?

Hello,
I am using PHP: 5.1.4-Debian-0.1~sarge1 . I activated the Domain (multisite) support - yes. Because I would like to support mobile.3ecke11er.de as mobil domain. I have no access to my server logs. I hope this informations will help.