#9 grain did not save config-changes

[Waldemar Moll]

Hi there,
got a problem on changing config-parameters. The error is starting on "Navigation" and occurs on all the pages folow.
The error is diplayin whe the page opens. Any changes on the page are not saved after submitting. Online there's no error diplayed.
---snip---
[Mon Feb 22 16:17:46 2010] [error] [client 91.37.80.144] PHP Warning: preg_match_all(): Compilation failed: unrecognized character after (?< at offset 3 in /srv/www/vhosts/terranet.de/httpdocs/wordpress/wp-content/themes/grain/func/locale.php on line 225, referer: http://www.xxxx.de/wordpress/wp-admin/admin.php?page=wp-content/themes/grain/admin/page.navigation.php
---snap---

Any help is welcome ....
-darkfirex