RootMissing error on branch

I got a RootMissing error when I tried to branch a hg branch. Here is a copy of the terminal output:

~ $ hg clone http://hg.3aims.com/public/AuthKit
real URL is https://hg.3aims.com/public/AuthKit
destination directory: AuthKit
requesting all changes
adding changesets
adding manifests
adding file changes
added 183 changesets with 1912 changes to 1351 files
updating to branch default
1049 files updated, 0 files merged, 0 files removed, 0 files unresolved
~ $ bzr branch AuthKit AuthKit-bzr
bzr: failed to report crash using apport:
     OSError(13, 'Permission denied')
bzr: ERROR: bzrlib.errors.RootMissing: The root entry of a tree must be the first entry supplied to record_entry_contents.

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 912, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 1112, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 690, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 705, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/builtins.py", line 1246, in run
    source_branch=br_from)
  File "/usr/lib/python2.6/dist-packages/bzrlib/bzrdir.py", line 1259, in sprout
    result_repo.fetch(source_repository, fetch_spec=fetch_spec)
  File "/usr/lib/python2.6/dist-packages/bzrlib/repository.py", line 1740, 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/plugins/hg/fetch.py", line 647, in fetch
    self.addchangegroup(cg, mapping)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/hg/fetch.py", line 526, in addchangegroup
    self._add_inventories(todo, mapping, pb)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/hg/fetch.py", line 386, in _add_inventories
    basis_inv)
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/groupcompress_repo.py", line 866, in add_inventory_by_delta
    raise errors.RootMissing()
RootMissing: The root entry of a tree must be the first entry supplied to record_entry_contents.

bzr 2.2.1 on python 2.6.6 (Linux-2.6.35-23-generic-pae-i686-with-Ubuntu-10.10-maverick)
arguments: ['/usr/bin/bzr', 'branch', 'AuthKit', 'AuthKit-bzr']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_ZA.utf8'
plugins:
  bash_completion /usr/lib/python2.6/dist-packages/bzrlib/plugins/bash_completion [2.2.1]
  bookmarks /home/garyvdm/.bazaar/plugins/bookmarks [unknown]
  builddeb /usr/lib/python2.6/dist-packages/bzrlib/plugins/builddeb [2.2.0]
  bzrtools /usr/lib/python2.6/dist-packages/bzrlib/plugins/bzrtools [2.2.0]
  dbus /usr/lib/python2.6/dist-packages/bzrlib/plugins/dbus [0.1.0dev]
  explorer /home/garyvdm/.bazaar/plugins/explorer [1.1.0dev]
  extmerge /home/garyvdm/.bazaar/plugins/extmerge [unknown]
  fastimport /usr/lib/python2.6/dist-packages/bzrlib/plugins/fastimport [0.9.0dev]
  git /usr/lib/python2.6/dist-packages/bzrlib/plugins/git [0.5.2]
  hg /usr/lib/python2.6/dist-packages/bzrlib/plugins/hg [0.2.0dev]
  launchpad /usr/lib/python2.6/dist-packages/bzrlib/plugins/launchpad [2.2.1]
  loom /usr/lib/python2.6/dist-packages/bzrlib/plugins/loom [2.1.0]
  netrc_credential_store /usr/lib/python2.6/dist-packages/bzrlib/plugins/netrc_credential_store [2.2.1]
  news_merge /usr/lib/python2.6/dist-packages/bzrlib/plugins/news_merge [2.2.1]
  pqm /usr/lib/python2.6/dist-packages/bzrlib/plugins/pqm [1.4.0dev]
  qbzr /home/garyvdm/.bazaar/plugins/qbzr [0.20.0dev1]
  rewrite /home/garyvdm/.bazaar/plugins/rewrite [0.6.1dev]
  search /usr/lib/python2.6/dist-packages/bzrlib/plugins/search [1.7.0dev]
  stats /usr/lib/python2.6/dist-packages/bzrlib/plugins/stats [0.1.0dev]
  svn /usr/lib/python2.6/dist-packages/bzrlib/plugins/svn [1.0.4]
  upload /home/garyvdm/.bazaar/plugins/upload [1.0.0dev]
  vimdiff /home/garyvdm/.bazaar/plugins/vimdiff [unknown]

*** 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.