I'm trying to bzr push --overwrite in subversion repository but I get this error:

$ bzr push --overwrite https://trac.nbic.nl/svn/mzcms/trunk                                                       ─┘
bzr: ERROR: subvertpy.SubversionException: ("File or directory '.' is out of date; try updating", 160024)               

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/bzrlib/commands.py", line 853, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/bzrlib/commands.py", line 1055, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.6/site-packages/bzrlib/commands.py", line 661, in run_argv_aliases
    return self.run_direct(**all_cmd_args)
  File "/usr/lib/python2.6/site-packages/bzrlib/commands.py", line 665, in run_direct
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/bzrlib/cleanup.py", line 122, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/bzrlib/cleanup.py", line 156, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/bzrlib/builtins.py", line 1146, in run
    use_existing_dir=use_existing_dir)
  File "/usr/lib/python2.6/site-packages/bzrlib/push.py", line 141, in _show_push_branch
    remember, create_prefix)
  File "/usr/lib/python2.6/site-packages/bzrlib/plugins/svn/remote.py", line 250, in push_branch
    overwrite=overwrite)
  File "/usr/lib/python2.6/site-packages/bzrlib/branch.py", line 971, in push
    *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/bzrlib/plugins/svn/branch.py", line 1012, in push
    override_svn_revprops=_override_svn_revprops)
  File "/usr/lib/python2.6/site-packages/bzrlib/plugins/svn/branch.py", line 922, in _update_revisions
    push_merged, overwrite=overwrite)
  File "/usr/lib/python2.6/site-packages/bzrlib/plugins/svn/push.py", line 217, in push_branch
    overwrite=overwrite)
  File "/usr/lib/python2.6/site-packages/bzrlib/plugins/svn/push.py", line 239, in push
    override_svn_revprops=target_config.get_override_svn_revprops())
  File "/usr/lib/python2.6/site-packages/bzrlib/plugins/svn/push.py", line 153, in push_revision_tree
    revid = builder.commit(rev.message)
  File "/usr/lib/python2.6/site-packages/bzrlib/plugins/svn/errors.py", line 143, in convert
    raise convert_error(e)
SubversionException: ("File or directory '.' is out of date; try updating", 160024)

bzr 2.1.2 on python 2.6.5 (Linux-2.6.34-ARCH-x86_64-Intel-R-_Xeon-TM-_CPU_3.00GHz-with-glibc2.2.5)
arguments: ['/usr/bin/bzr', 'push', '--overwrite', 'https://trac.nbic.nl/svn/mzcms/trunk']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  launchpad            /usr/lib/python2.6/site-packages/bzrlib/plugins/launchpad [2.1.2]
  netrc_credential_store /usr/lib/python2.6/site-packages/bzrlib/plugins/netrc_credential_store [2.1.2]
  news_merge           /usr/lib/python2.6/site-packages/bzrlib/plugins/news_merge [2.1.2]
  rewrite              /usr/lib/python2.6/site-packages/bzrlib/plugins/rewrite [0.6.1]
  svn                  /usr/lib/python2.6/site-packages/bzrlib/plugins/svn [1.0.3]

*** Bazaar has encountered an internal error.  This probably indicates a
    bug in Bazaar.  You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.