Cannot get my custom validation to work,

[eluser]boltsabre[/eluser]
Ah, quick edit. I first developed the 'filterBadWords' function in the controller and called it using the standard callback_filterBadWords as outlined in the documentation, and it was working perfect.

I am now only getting this message since I moved the function to the class extension 'MY_Form_validation extends CI_Form_validation', so that is where the problem lies... any thoughts would be great, I'm realively new to CI and this is the first time I've tried extending a core class (have I saved it in the correct folder?) Okay, cheers guys, hope someone can help me, many thanks in advance!!!