Error 403 after changing default root

[Ryan Li]

Binary package hint: apache2

I'm using ubuntu 9.04 with apache 2.2.11-2ubuntu2.

I've changed the default root to a directory placed under my home directory, following the directions in:
https://help.ubuntu.com/community/ApacheMySQLPHP#Virtual%20Hosts
However, I cannot access the files after I changed the default root.
The permission of directories and files are 755, and there're no scripts such as php.
Apache is run under default user/group.
A brief of /var/log/apache2/error.log:
[Tue Jun 09 22:01:52 2009] [error] [client 127.0.0.1] (13)Permission denied: access to /index.htm denied
[Tue Jun 09 22:01:56 2009] [error] [client 127.0.0.1] (13)Permission denied: access to /indeex.htm denied
[Tue Jun 09 22:11:04 2009] [error] [client 127.0.0.1] (13)Permission denied: access to /favicon.ico denied
[Tue Jun 09 22:13:59 2009] [error] [client ::1] (13)Permission denied: access to / denied
[Tue Jun 09 22:13:59 2009] [error] [client ::1] (13)Permission denied: access to /favicon.ico denied
[Tue Jun 09 22:14:54 2009] [error] [client ::1] (13)Permission denied: access to /favicon.ico denied