Please upgrade to 2.3 here.
The 2.2 and earlier branches are no longer being updated.
This discussion is related to the Sitemaps
This is a bugfix version that fixes a couple of blatantly wrong lines of code and hopefully allows the plugin to work out-of-the-box.
The sitemaps should update themselves. Initially there will not be any sitemaps available, but auto-generation will occur as soon as a discussion is posted.