Apache cgi 433 forbidden error



I am tring to set up apache cgi on osx and
if I use ruby script/server, the application works ok.

If I use apache cgi, I can see the index.html page
Once I remove the page, I get the following error

You don’t have permission to access / on this serve

this is my apache set up. I am use mysql 5.0.

<VirtualHost *:80>
ServerName babyspace
DocumentRoot /Users/chongqing/rails/babyspace/public
ErrorLog /Users/chongqing/rails/babyspace/log/apache.log

<Directory //Users/chongqing/rails/babyspace/public/>
Options ExecCGI FollowSymLinks
AllowOverride all
Allow from all
Order allow,deny