export does not work

[ITSec_Mike]

Hi all


By using bzr export file.tgz I get the following error:

ceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 817, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 779, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 477, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 2067, in run
    export(t, dest, format, root)
  File "/usr/lib/python2.5/site-packages/bzrlib/export/__init__.py", line 95, in export
    return _exporters[format](tree, dest, root)
  File "/usr/lib/python2.5/site-packages/bzrlib/export/__init__.py", line 61, in _loader
    return func(tree, dest, root)
  File "/usr/lib/python2.5/site-packages/bzrlib/export/tar_exporter.py", line 55, in tgz_exporter
    tar_exporter(tree, dest, root, compression='gz')
  File "/usr/lib/python2.5/site-packages/bzrlib/export/tar_exporter.py", line 41, in tar_exporter
    entries.next() # skip root
StopIteration

bzr 0.90.0 on python 2.5.1.final.0 (linux2)
arguments: ['/usr/bin/bzr', 'export', 'file.tgz']


Please find following some infos about my system:
uname -a
Linux <name> 2.6.22-14-generic #1 SMP Tue Dec 18 08:02:57 UTC 2007 i686 GNU/Linux

bzr --version
Bazaar (bzr) 0.90.0
  Python interpreter: /usr/bin/python 2.5.1.final.0
  Python standard library: /usr/lib/python2.5
  bzrlib: /usr/lib/python2.5/site-packages/bzrlib


Any help is very much appreciated
--
Thanks,
Mike