CakePHP 2.3.9 - Problems with Authentication

Hello! I'm brazilian, sorry for my bad english.

I'm using CakePHP 2.3.9, i can find results, save, update and delete, but when i'm trying to authenticate with Auth, i always receive the same message. "Username and password is not valid", but i'm insert the user correctly. I'm using the cakephp documentation. http://book.cakephp.org/2.0/pt/tutorials-and-examples/blog-auth-example/auth.html.

Thank's.
Henrique

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