gannotate fails with traceback in revno 186

bzr gannotate file

fails with traceback:
bzr: ERROR: exceptions.NameError: global name 'gtk' is not defined

Traceback (most recent call last):
  File "/v/home/vila/src/bzr.dev/bzrlib/commands.py", line 638, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/v/home/vila/src/bzr.dev/bzrlib/commands.py", line 600, in run_bzr
    ret = run(*run_argv)
  File "/v/home/vila/src/bzr.dev/bzrlib/commands.py", line 296, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/vila/.bazaar/plugins/gtk/__init__.py", line 296, in run
    gtk.main()
NameError: global name 'gtk' is not defined

bzr 0.16.0dev0 on python 2.4.4.candidate.1 (linux2)
arguments: ['/home/vila/bin/bzr', 'gannotate', '__init__.py']