Error: Class 'SimplePasswordHasher' not found

Hi all,
 
I am receiving this message Error:Class 'SimplePasswordHasher' not found

I am following the tutorial http://book.cakephp.org/2.0/en/tutorials-and-examples/blog-auth-example/auth.html for Simple Authentication and Authorization.  I found this thread https://groups.google.com/forum/#!topic/cake-php/wL6f3MG_M8c but it doesn't have an answer for me . Any suggestions?

I have this at top of User.php is models
App::uses('SimplePasswordHasher','Controlller/Component/Auth');

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