Extending CI_Exceptions is not working?

[eluser]CroNiX[/eluser]
Is the file name actually capitalized? /application/core/MY_Exceptions.php? Some os's are case sensitive.

This is why it's best to use a virtual machine to develop on where the OS and setup is identical to the production server. You don't run into problems like "works on development but not production server".

Edit: MY_Exceptions must be capitalized like that in the class definition as well as the filename.

class MY_Exceptions extends CI_Exceptions... (you have a lower-case y in My)