I have got a Joomla site where I recieve this error (and little else) around the home page. I do not presently have the PHP logs (however i will have Apache logs). Can there be in whatever way to debug this?

This website works fine on my small local machine (Win XP, Apache 2.2.6, PHP 5.2.2) but fails around the live box (RHel, Apache 2.2.3, PHP 5.1.6).

Could this be considered a PHP version error?