Installation: Url problem in Modx

We installed plooger in root/gallery/. Then, we included the gallery into a template (modxcms using snippets), which worked out fine. The collections are displayed on the website as they should.

We have a problem displaying the albums of a collection. In the "view" option of the backend, everything works fine. On the website on which we use the gallery template (test), we have no access to the albums. Even though we see the albums in the collection, there is no access to the album itself (root/index.php?level=album&id=1). The links are leading to a 404-site and the site "test" is not included in the link. If we manually add "test" (root/test/index.php?level=album&id=1) we again are referred to a 404-site.

So, the problem is clearly that the links to the album are incorrect. We tried to change some things in the htacces which did not work out.

Is somebody able to help us out?