crash when converting lightweight to heavy checkout with remote master branch

I encountered a traceback when trying to perform a 'bzr reconfigure --checkout' command on a lightweight checkout of a remote master branch.

crash file is attached

PythonVersion: 2.6.4
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 5445, in run
     reconfiguration.apply(force)
   File "/usr/lib/python2.6/dist-packages/bzrlib/reconfigure.py", line 330, in apply
     repo = repository_format.initialize(self.bzrdir)
   File "/usr/lib/python2.6/dist-packages/bzrlib/remote.py", line 555, in initialize
     return self._vfs_initialize(a_bzrdir, shared)
   File "/usr/lib/python2.6/dist-packages/bzrlib/remote.py", line 548, in _vfs_initialize
     return self.open(a_bzrdir)
   File "/usr/lib/python2.6/dist-packages/bzrlib/remote.py", line 594, in open
     raise AssertionError('%r is not a RemoteBzrDir' % (a_bzrdir,))
 AssertionError: <bzrlib.bzrdir.BzrDirMeta1 object at 0x24acad0> is not a RemoteBzrDir