Attempting a lightweight checkout raises KeyError exception

Server is: svn+https://papyrus.usask.ca/svn/dept. I've set my svn-branching-scheme to be:

gt/trunk
gt/branches/*
gt/tags/*
hci/projects/*/*

Trying to a lightweight check out svn+https://papyrus.usask.ca/svn/dept/gt/trunk fails with a KeyError exception. I was able to do a lightweight checkout previously when the branching-scheme was 'single' and mandatory was 'False'.

$ cat ~/.bazaar/subversion.conf
[2d47b262-a5da-0310-af36-9ee85df9eb2a]
locations = svn+https://papyrus.usask.ca/svn/dept;https://papyrus.usask.ca/svn/dept
branching-scheme = list-QlpoOTFBWSZTWedGXbUAAA3RgAAQABC6-d4AIAAhoRoDI00KZMTIMjNoVAIQx5jLy94_UZgOCL1nWol3lDJRu_xdyRThQkOdGXbU
branching-scheme-mandatory = True

$ bzr co --lightweight svn+https://papyrus.usask.ca/svn/dept/gt/trunk gt-trunk
bzr: ERROR: exceptions.KeyError: 'svn-v3-list-QlpoOTFBWSZTWedGXbUAAA3RgAAQABC6-d4AIAAhoRoDI00KZMTIMjNoVAIQx5jLy94_UZgOCL1nWol3lDJRu_xdyRThQkOdGXbU:2d47b262-a5da-0310-af36-9ee85df9eb2a:gt%2Ftrunk:4882'

Traceback (most recent call last):
  File "/usr/pkg/lib/python2.4/site-packages/bzrlib/commands.py", line 806, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/pkg/lib/python2.4/site-packages/bzrlib/commands.py", line 762, in run_bzr
    ret = run(*run_argv)
  File "/usr/pkg/lib/python2.4/site-packages/bzrlib/commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/pkg/lib/python2.4/site-packages/bzrlib/builtins.py", line 989, in run
    accelerator_tree)
  File "/Users/bsd/.bazaar/plugins/svn/branch.py", line 189, in create_checkout
    return self._create_lightweight_checkout(to_location, revision_id)
  File "/Users/bsd/.bazaar/plugins/svn/branch.py", line 183, in _create_lightweight_checkout
    return WorkingTree.open(to_location)
  File "/usr/pkg/lib/python2.4/site-packages/bzrlib/workingtree.py", line 333, in open
    return control.open_workingtree(_unsupported)
  File "/Users/bsd/.bazaar/plugins/svn/workingtree.py", line 751, in open_workingtree
    return SvnWorkingTree(self, self.local_path, self.open_branch())
  File "/Users/bsd/.bazaar/plugins/svn/workingtree.py", line 92, in __init__
    self.base_tree = SvnBasisTree(self)
  File "/Users/bsd/.bazaar/plugins/svn/tree.py", line 227, in __init__
    workingtree.branch.mapping)
  File "/Users/bsd/.bazaar/plugins/svn/repository.py", line 259, in get_fileid_map
    self.revision_fileid_renames, mapping)
  File "/Users/bsd/.bazaar/plugins/svn/fileids.py", line 173, in get_map
    revmap = self._apply_changes(new_file_id, changes, find_children)
  File "/Users/bsd/.bazaar/plugins/svn/fileids.py", line 219, in _apply_changes
    for c in find_children(data[1], data[2]):
  File "/Users/bsd/.bazaar/plugins/svn/fileids.py", line 163, in find_children
    (revnum, bp) = quickrevidmap[revid]
KeyError: 'svn-v3-list-QlpoOTFBWSZTWedGXbUAAA3RgAAQABC6-d4AIAAhoRoDI00KZMTIMjNoVAIQx5jLy94_UZgOCL1nWol3lDJRu_xdyRThQkOdGXbU:2d47b262-a5da-0310-af36-9ee85df9eb2a:gt%2Ftrunk:4882'

bzr 1.1.0 on python 2.4.4.final.0 (darwin)
arguments: ['/usr/pkg/bin/bzr', 'co', '--lightweight', 'svn+https://papyrus.usask.ca/svn/dept/gt/trunk', 'gt-trunk']
encoding: 'UTF-8', fsenc: 'utf-8', lang: 'en_CA.UTF-8'
plugins:
  automv /Users/bsd/.bazaar/plugins/automv [unknown]
  launchpad /usr/pkg/lib/python2.4/site-packages/bzrlib/plugins/launchpad [unknown]
  multiparent /usr/pkg/lib/python2.4/site-packages/bzrlib/plugins/multiparent.pyc [unknown]
  svn /Users/bsd/.bazaar/plugins/svn [0.4.8dev0]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.