ispconfig 2 - joomla site

[onastvar]

I've upgraded joomla site from 1.5.1 to 1.5.11 and now my index page is blank, however, i can get into the joomla admin panel. I have CentOS 5.1 with ISPConfig 2.24. My other joomla sites are working fine.

Any suggestions, how to fix these PHP errors?

error log shows the following
HP Warning: PHP Startup: XCache: Unable to initialize module, referer: http://mywebsite.com/
Module compiled with module API=20050922, debug=0, thread-safety=0, referer: http://mywebsite.com/
PHP compiled with module API=20060613, debug=0, thread-safety=0, referer: http://mywebsite.com/
These options need to match, referer: http://mywebsite.com/
in Unknown on line 0, referer: http://mywebsite.com/

[falko]

You might have to update XCache (or disable it for testing purposes).

[onastvar]

Thanks Falko!

I ended up installing joomla 1.5.10 into a new folder, moved my customized settings from joomla 1.5.1 to newly installed joomla. I used same mysql db.