How can I disable Kohana 3.3 error message?-Collection of common programming errors

I’m using the Kohana 3.3 framework. I’m trying to disable the error messages for production machine.

The error message looks like : http://i.stack.imgur.com/dY2yD.png

In the production machine, I want to disable the debug tracking and the error message. I tried lots of ways but it didn’t work.

So, my question is: How can I disable the exception error messages ? Thanks.