cake 2.0.5 AppExceptionRenderer not found error

I want to use my custom exception renderer to show 404 pages, I created a AppExceptionRenderer class located in app/Lib/Error/AppExceptionRenderer.php, and I changed exception config to Configure::write('Exception.renderer', 'AppExceptionRenderer');
but when i open a non exist address, cake give this error

Fatal error: Class 'AppExceptionRenderer' not found in ......../lib/Cake/Error/ErrorHandler.php on line 126 Call Stack: 0.0161 4592240 1. ErrorHandler::handleException() ......./lib/Cake/Error/ErrorHandler.php:0

seems it can't locate the AppExceptionRenderer file, but according to the manual, I do put it in app/Lib/Error, please help

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Perry | 彭琪

http://pengqi.me

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