Try to see http://dev.plone.org/collective/browser/frs and couldn't.

[natxooy@…]

I got this error:

Traceback (most recent call last):
  File "/usr/local/lib/python2.4/site-packages/trac/web/main.py", line 387, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.4/site-packages/trac/web/main.py", line 191, in dispatch
    chosen_handler = self._pre_process_request(req, chosen_handler)
  File "/usr/local/lib/python2.4/site-packages/trac/web/main.py", line 263, in _pre_process_request
    chosen_handler = f.pre_process_request(req, chosen_handler)
  File "/usr/local/lib/python2.4/site-packages/trac/versioncontrol/api.py", line 73, in pre_process_request
    self.get_repository(req.authname) # triggers a sync if applicable
  File "/usr/local/lib/python2.4/site-packages/trac/versioncontrol/api.py", line 101, in get_repository
    repos = self._connector.get_repository(rtype, rdir, authname)
  File "/usr/local/lib/python2.4/site-packages/trac/versioncontrol/svn_fs.py", line 260, in get_repository
    crepos = CachedRepository(self.env.get_db_cnx(), repos, None, self.log)
  File "/usr/local/lib/python2.4/site-packages/trac/versioncontrol/cache.py", line 34, in __init__
    self.sync()
  File "/usr/local/lib/python2.4/site-packages/trac/versioncontrol/cache.py", line 99, in sync
    (str(current_rev), path, kind, action,
  File "/usr/local/lib/python2.4/site-packages/trac/db/util.py", line 50, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/local/lib/python2.4/site-packages/trac/db/util.py", line 50, in execute
    return self.cursor.execute(sql_escape_percent(sql), args)
  File "/usr/lib/python2.4/site-packages/pyPgSQL/PgSQL.py", line 3111, in execute
    raise OperationalError, msg
OperationalError: ERROR:  duplicate key violates unique constraint "node_change_pk"

[Christian Boos]

Duplicate of #4043.

The administrator of that Trac instance should

1. stop the server
2. run trac-admin resync to fix the current locked state
3. upgrade to 0.10.4 so that the issue won't happen again