Can't synchronize with the repository

[fen@…]

hi!

change repository_dir!

Can't synchronize with the repository (The 'repository_dir' has changed, a 'trac-admin resync' operation is needed.)

do trac-admin resync
C:\Program Files\Python25\lib\site-packages\matplotlib\__init__.py:753: UserWarn
ing:  This call to matplotlib.use() has no effect
because the the backend has already been chosen;
matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time.

  warnings.warn(_use_error_msg)
Resyncing repository history...
41 revisions cached. Done.

But nothing occurs! Can't synchronize with the repository (The 'repository_dir' has changed, a 'trac-admin resync' operation is needed.)

Where there can be a problem?

[Emmanuel Blot]

This error is likely to be due to an error in a plugin (or a plugin configuration issue) which relies on matplotlib.
Try disabling the faulty plugin, and/or report the error to the plugin maintainer.

This does not look like to be a Trac issue.
Feel free to reopen this ticket if the bug still occurs once you've disabled the installed plugins.