Yii Url Pattern Problem

I am trying to install my website in a new server, which has centos5.8 and php5.1.6. But I got the following error,


The URL pattern ".*" for route "site/index" is not a valid regular expression.


Reading some posts, it says about the pcre lib problem. I checked my php, it says,

> php -i | grep PCRE

PHP Warning: Module ‘PDO’ already loaded in Unknown on line 0

PCRE (Perl Compatible Regular Expressions) Support => enabled

PCRE Library Version => 6.6 06-Feb-2006

I checked with

> php -i | grep pcre

it says,

‘–with-pcre-regex=/usr’

Can anyone help me with this problem?

Thanks a lot!