noobie- help with cake blog tutorial - Error PostsController could not be found

I am running WAMP server on my windows 8 laptop.
I have cake installed and the test screen shows up as OK.
There is more detail on that on my personal blog here

I am trying to follow the blog tutorial from the cake web site
here:
http://book.cakephp.org/2.0/en/tutorials-and-examples/blog/blog.html

The problem I get is that when I try

http://localhost/cake_2_0/posts/index  
I get and get a page full of errors (see below)
Error: PostsController could not be found.
Error: Create the class PostsController below in file: app\controller\PostsController.php


I believe that I have followed the tutorial accurately.  Again I have documented it step by step on my blog.
Here:
http://frankstech.blogspot.com.au/2013/10/cakephp-blog-tutorial.html

Any suggestions on what I can do to track this issue down.

Thanks in advance.
Frank

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