TypeError: not all arguments converted during string formatting; encoding: 'utf-8', fsenc: 'UTF-8', lang: 'pt_BR.UTF-8'

bzr: ERROR: exceptions.TypeError: not all arguments converted during string formatting

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1141, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 697, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 3689, in run
    lossy=lossy)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 218, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/workingtree_4.py", line 218, in commit
    result = WorkingTree.commit(self, message, revprops, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 218, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/mutabletree.py", line 211, in commit
    *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commit.py", line 290, in commit
    lossy=lossy)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 132, in run
    self.cleanups, self.func, self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commit.py", line 455, in _commit
    self._update_branches(old_revno, old_revid, new_revno)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commit.py", line 494, in _update_branches
    self.branch.set_last_revision_info(new_revno, self.rev_id)
  File "/usr/lib/python2.7/dist-packages/bzrlib/decorators.py", line 218, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 2472, in set_last_revision_info
    self._run_post_change_branch_tip_hooks(old_revno, old_revid)
  File "/usr/lib/python2.7/dist-packages/bzrlib/branch.py", line 1203, in _run_post_change_branch_tip_hooks
    hook(params)
  File "/home/minahim/.bazaar/plugins/automirror/__init__.py", line 86, in branch_tip_change_hook
    Updater(branch, new_revid, branch.get_config()).mirror_to_targets()
  File "/home/minahim/.bazaar/plugins/automirror/updater.py", line 88, in mirror_to_targets
    trace.mutter("mirroring to targets " % self.targets())
TypeError: not all arguments converted during string formatting

bzr 2.6b2 on python 2.7.3 (Linux-3.5.0-25-lowlatency-x86_64-with-
    Ubuntu-12.10-quantal)
arguments: ['/usr/bin/bzr', 'commit', '-m', 'dataproc0']
plugins: automirror[0.1.0], bash_completion[2.6b2], bzrtools[2.5.0],
    changelog_merge[2.6b2], dbus[0.1.0dev], explorer[1.3.0],
    fastimport[0.13.0], git[0.6.9], grep[0.5.0dev], launchpad[2.6b2],
    loom[2.2.0], netrc_credential_store[2.6b2], news_merge[2.6b2],
    pipeline[1.4.0], po_merge[2.6b2], pqm[1.4.0dev], qbzr[0.22.2],
    rewrite[0.6.4dev], search[1.7.0dev], stats[0.2.0dev], svn[1.2.1],
    upload[1.0.1dev], weave_fmt[2.6b2]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'pt_BR.UTF-8'

*** 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.