How to redirect a page to the custom location after form validation? I have a form with comment section. when the comment is given as empty it redirects to the page called /comment/reply. I have to change it to my custom path. how can i do this
You shouldn't really do it in validator. Redirect in submit handler, with code like:

$form_state['redirect'] = 'comment/reply';


For more details of form redirecting consult official documentation.