Custom callback function in form validation not working

[eluser]toopay[/eluser]
Did you load the form validation class before call/use its function? Seems that class wasn't declared yet.

Code:

$this->load->library('form_validation');

And it should be simply like

Code:

$this->form_validation->set_rules();

instead

Code:

$this->my_form->form_validation->set_rules();

except, you did already declare 'my_form' variable as CI instance.