Problem on Error Handling with CAKEPHP

Hi
I would use the Error HAndling of CAKEPHP.
I create a my function in app_error.php
Now if I set the debug to 0 if I use this function I get always
another page (I think the error404 )
If I set debug to 1 I get the right error's page but I get a
performance's worsening.
What can I do ?
Many Thanks
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