Using CakePHP for the first time

I run into this error trying to load the index page of cake php:

Fatal error: Class ‘Debugger’ not found in C:\Users\Public\public_html\cakephp\cake\libs\view\pages\home.ctp on line 26

I just downloaded the zipped file and my server runs smoothly. Any local variable or other setting I should be aware of?
Thanks

To use the debugger, first ensure that Configure::read(‘debug’) is set to a value greater than 0.

Thanks, and is because I was downloading the wrong file.
I’m up and running