Problem with lighty and fast-cgi

I upgraded my server yesterday, and the log is showing this error:

2008-02-28 09:48:24: (mod_fastcgi.c.2570) FastCGI-stderr: PHP Warning: preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Compilation failed: missing ) at offset 47 in /var/www/html/foro/includes/functions_vbseo_crr.php on line 82
PHP Warning: preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Compilation failed: missing ) at offset 43 in /var/www/html/foro/includes/functions_vbseo_crr.php on line 82

ok I could insert a closing ")" on line 82, but why is this error appearing?

I have the following:

PHP 5.1.6 (cli)
Zend Engine v2.1.0
lighttpd-1.4.18 (ssl)

Edit: ok, I believe I had this error going on longer than I thought, but I never paid attention.

It was caused by a couple of lousy custom rewrites XD sorry.

Yes, looks like it was related to incorrect CRRs defined in vBSEO CP. I'm glad you got it resolved!