I installed this plugin. Then I go to the url which is http://tags.mydomain.com. But it showed me this error.

The blog you have requested is not installed properly. Please contact the system administrator.

I am usting WPMU 2.7.1, BuddyPress 1.0

http://wpmudev.org/project/Sitewide-Extended-Categories-Widget

But currently it doesn’t show me anything in the category. Is it because of the blog is not installed proplery ? Or Any idea please ? Thanks.