Validation Rules

[eluser]CroNiX[/eluser]
That would go back to our discussion from yesterday where the error name must match the name of the callback function exactly.

Code:

public function _some_callback($var)
{
  if ($var == 'something')
  {
    //failed, set the error message
    $this->form_validation->set_message('_some_callback', 'This is the error message that will display for _some_callback');
    return FALSE;
  }
  return TRUE; //passed
}

function name is "_some_callback"
error message set for "_some_callback"
If these 2 names don't match exactly, you'll get the error you are because it won't be able to find the error message that goes to that validation rule...