Captcha integration problem in cakePHP

Hi, I am cakePHP learner..
I am making an simple application like Quick post of jobs & in this I want to implement the Captcha in my form.For this I help from the link : http://bakery.cakephp.org/articles/view/improved-captcha-component

I have added captcha.php file to helper and to component as mentioned link above link...

but I am getting Problem like below if I run,

Notice (8): Undefined variable: captcha
 

Fatal error: Call to a member function input() on a non-object.

Please anybody help me to sort out this..

Thanks & Regards,
Vidya

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