Help Cake newbie (i really want to bake succesfully)

I followed this artciel http://www.packtpub.com/article/working-with-simple-associations-using-cakephp

But when was unable to get everything working correctly.
I got everything working up to a point but at this point "Retrieving
Related Model Data in One-To-Many Relation" is where I started having
problems.

the error I am getting is below:

Notice (8): Undefined index: Book [APP/views/authors/index.ctp, line
1]

Anyone have any suggestions? Perhaps I have created the foreign key
incorrectly? I have been trying to figure it out for the past hour and
no luck. I hope someone can help me.

Signed

new baker

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