What are you using for a testing server on your local machine?
MAMP is the most common for macintosh
by default, MAMP will create a folder in the applications folder that maps to the http://localhost address:
you would pput the site files inside that folder
and set the url to:
by putting the files in your users folder, it is not in a location that the local host address would map to.
see the tutorial for details on defining a site:
and this one for details on installing a local testing server: