Comment 1 for bug 1982

  Module zope.tales.expressions, line 198, in _eval
    return ob()
  Module canonical.launchpad.browser.potemplate, line 135, in submitForm
    self.upload()
  Module canonical.launchpad.browser.potemplate, line 174, in upload
    tarball = helpers.RosettaReadTarFile(stream=file)
  Module canonical.launchpad.helpers, line 126, in __init__
    self.tarfile = tarfile.open('', 'r', stream)
  Module tarfile, line 916, in open
    return func(name, "r", fileobj)
  Module tarfile, line 996, in bz2open
    raise ValueError, "no support for external file objects"
ValueError: no support for external file objects