Multiple websites running from once application core

[eluser]lordmilutin[/eluser]
[quote author="CroNiX" date="1382921121"]Try using a full path[/quote]

I do not get errors for including files, I get erros like

Code:

Fatal error: Call to a member function item() on a non-object in C:\wamp\www\projectX\application\engine\system\core\Utf8.php on line 47

and

Fatal error: Call to a member function elapsed_time() on a non-object in C:\wamp\www\projectX\application\engine\system\core\Output.php on line 360