OpenStack配置horizon出现的问题

你好，我在为http创建horizon配置文件时出错，配置文件内容为：
WSGIScriptAlias / /usr/lib/python2.6/site-packages/horizon-2012.1-py2.6.egg/openstack_dashboard/wsgi/django.wsgi
WSGIDaemonProcess horizon user=apache group=apache processes=3 threads=10 home=/usr/lib/python2.6/site-packages/horizon-2012.1-py2.6.egg
SetEnv APACHE_RUN_USER apache
SetEnv APACHE_RUN_GROUP apache
WSGIProcessGroup horizon
DocumentRoot /usr/lib/python2.6/site-packages/horizon-2012.1-py2.6.egg/.blackhole/
Alias /media /usr/lib/python2.6/site-packages/horizon-2012.1-py2.6.egg/openstack_dashboard/static
Options FollowSymLinks
AllowOverride None
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all
ErrorLog /var/log/httpd/horizon_error.log
LogLevel warn
CustomLog /var/log/httpd/horizon_access.log combined
WSGISocketPrefix /var/run/httpd
报错为httpd：Syntax error on line 17 of /etc/httpd/conf.d/horizon.conf:
DocumentRoot takes one argument, Root directory of the document tree
请教原因及解决方法，谢谢