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Strange behaviour after install (PHP problem?)

 * MediaWiki version: 1.13.2
 * PHP version: 5.2.6
 * MySQL version: 5.0.45
 * URL: http://www.mikakunii.net/mikawiki

A very strange behaviour of wiki after install: articles are not shown at all although content is present: try edit to see that its present, or follow http://www.mikakunii.net/MikaWiki that is working on the same database (that 2nd wiki was istalled after that problem did appear on the 1st).

During install process I had some warnings ( intall_log.txt for complete reference): I tried asking my hosting service assistance and they told me that the cause maybe was more due an error configuring mediawiki than a server problem. I installed same version on a localhost doing the same install procedure and everything has gone well so I suppose its a PHP error and not a configuration error, maybe am I wrong? I don't think its a mysql issue as the 2nd installation of mediawiki works good on the same database. And as the install procedure build everything was necessary I thought also its more concerning PHP than a installation error itself.

Notice warning during install procedure:

Warning: is_dir: open_basedir restriction in effect. File(/opt/pieroni/php5/session) is not within the allowed path(s):(/var/www/vhosts/mikakunii.net/httpdocs:/tmp) in /var/www/vhosts/mikakunii.net/httpdocs/mikawiki/config/index.php on line 438 Warning: Your session.save_path value (/opt/pieroni/php5/session) appears to be invalid or is not writable. PHP needs to be able to save data to this location for correct session operation.

Maybe this is the main problem or a sign of a lack of PHP config on server? Please help me, thank you. I tried to do my best... but can't solve this alone.