Fatal error Call to undefined method Controller Html()

I have this

var $helpers = array('Html', 'Form', 'Captcha');

and now when I use

$this->Captcha->show(); IT works perfectly..No issues there

but when I use something like

$this->Html('title' , '');

The error given is

Fatal error: Call to undefined method UsersController::Html()

So what could be causing this error ?

Any help would be greatly appreciated
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