Warning: Can't synchronize with the repository (Unsupported version control system "svn": "No module named svn" ). Look in the Trac log for more information.

Trac Error

Repository checkins event provider (ChangesetModule) failed:
TracError: Unsupported version control system "svn": "No module named svn"

You may want to see the other kind of events from the Timeline

TracGuide — The Trac User and Administration Guide