Possible filename change of My_Exceptions.php

[arjenschat]

Documentation addition:
You might want to change the name of My_exceptions.php based on your prefix config.

$config['subclass_prefix'] = 'app_';

[arjenschat]

If you have to change the filename to from My_exceptions.php to app_Exceptions.php for instance, you have to change it in all the files where it references to the My_exceptions class.