bzr: ERROR: bzrlib.errors.NoSuchRevision in _walk_to_common_revisions on RemoteRepository

Binary package hint: bzr

$ bzr merge lp:~shakaran/tivion/trunk
bzr: ERROR: bzrlib.errors.NoSuchRevision: RemoteRepository(bzr+ssh://bazaar.launchpad.net/~shakaran/tivion/trunk/.bzr/) has no revision <email address hidden>

*** 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
    attaching the crash file
        /home/shakaran/.cache/crash/bzr-20100316174344-14141.crash
    and including a description of the problem.

    The crash file is plain text and you can inspect or edit it to remove
    private information.

ProblemType: Bug
Architecture: i386
Date: Tue Mar 16 19:42:56 2010
DistroRelease: Ubuntu 10.04
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20091126)
Package: bzr 2.1.0-1
ProcEnviron:
 LANG=es_ES.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic-pae
SourcePackage: bzr
Uname: Linux 2.6.32-16-generic-pae i686

Traceback:
 Traceback (most recent call last):
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 853, in exception_to_return_code
     return the_callable(*args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 1055, in run_bzr
     ret = run(*run_argv)
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 661, in run_argv_aliases
     return self.run_direct(**all_cmd_args)
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 665, in run_direct
     return self._operation.run_simple(*args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/cleanup.py", line 122, in run_simple
     self.cleanups, self.func, *args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/cleanup.py", line 156, in _do_with_cleanups
     result = func(*args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/builtins.py", line 3794, in run
     location, revision, remember, possible_transports, pb)
   File "/usr/lib/python2.6/dist-packages/bzrlib/builtins.py", line 3923, in _get_merger_from_branch
     other_revision_id, base_revision_id, other_branch, base_branch)
   File "/usr/lib/python2.6/dist-packages/bzrlib/merge.py", line 363, in from_revision_ids
     merger.set_other_revision(other, other_branch)
   File "/usr/lib/python2.6/dist-packages/bzrlib/merge.py", line 505, in set_other_revision
     self._maybe_fetch(other_branch, self.this_branch, self.other_rev_id)
   File "/usr/lib/python2.6/dist-packages/bzrlib/merge.py", line 522, in _maybe_fetch
     target.fetch(source, revision_id)
   File "/usr/lib/python2.6/dist-packages/bzrlib/decorators.py", line 194, in write_locked
     result = unbound(self, *args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/branch.py", line 593, in fetch
     pb=pb)
   File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 1704, in fetch
     find_ghosts=find_ghosts, fetch_spec=fetch_spec)
   File "/usr/lib/python2.6/dist-packages/bzrlib/decorators.py", line 194, in write_locked
     result = unbound(self, *args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 3432, in fetch
     pb=pb, find_ghosts=find_ghosts)
   File "/usr/lib/python2.6/dist-packages/bzrlib/fetch.py", line 83, in __init__
     self.__fetch()
   File "/usr/lib/python2.6/dist-packages/bzrlib/fetch.py", line 105, in __fetch
     search = self._revids_to_fetch()
   File "/usr/lib/python2.6/dist-packages/bzrlib/fetch.py", line 174, in _revids_to_fetch
     find_ghosts=self.find_ghosts)
   File "/usr/lib/python2.6/dist-packages/bzrlib/decorators.py", line 140, in read_locked
     result = unbound(self, *args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 1531, in search_missing_revision_ids
     revision_id, find_ghosts)
   File "/usr/lib/python2.6/dist-packages/bzrlib/decorators.py", line 140, in read_locked
     result = unbound(self, *args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 3498, in search_missing_revision_ids
     return self._walk_to_common_revisions([revision_id])
   File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 3476, in _walk_to_common_revisions
     self.source, ghosts_to_check.pop())
 NoSuchRevision: RemoteRepository(bzr+ssh://bazaar.launchpad.net/~shakaran/tivion/trunk/.bzr/) has no revision <email address hidden>