issue with php require_once in wordpress

I have installed wordpress on my freebsd 8.1 where i have php5.3 and nginx 1.0 webserver i can see that require_once function in php is not working but here require is working how can i fix this bug in freebsd.
 
I would bet it's not a 'FreeBSD' issue. Have you tried, and what's exactly the output.

Code:
// Report all PHP errors
error_reporting(E_ALL);
 
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