I'm trying to integrate a media wiki into our tuleap. I could successfully install the plugin and activate it in the project, but when I open the mediawiki tab in the tuleap I get an error message:

Mediawiki for project ... cannot be found, please contact your system admininistrators.

Now the question arises what I should have done differently? The documentation is very incomplete. Do I have to install Mediawiki separately, do I have to create special databases and assign rights? Help (and a better documentation) is very welcome.