submission of results from 16.04 desktop failed

narinder@narinder:~/Downloads$ canonical-certification-submit --secure_id=a00D000000feLvDIAU ./submission.xml
Traceback (most recent call last):
  File "/usr/bin/checkbox", line 9, in <module>
    load_entry_point('checkbox-ng==0.24', 'console_scripts', 'checkbox')()
  File "/usr/lib/python3/dist-packages/checkbox_ng/main.py", line 40, in main
    raise SystemExit(CheckboxTool().main(argv))
  File "/usr/lib/python3/dist-packages/plainbox/impl/clitools.py", line 310, in main
    self._parser = self.construct_parser(early_ns)
  File "/usr/lib/python3/dist-packages/plainbox/impl/clitools.py", line 469, in construct_parser
    self.add_subcommands(subparsers, early_ns)
  File "/usr/lib/python3/dist-packages/checkbox_ng/tools.py", line 96, in add_subcommands
    from checkbox_ng.commands.launcher import LauncherCommand
  File "/usr/lib/python3/dist-packages/checkbox_ng/commands/launcher.py", line 35, in <module>
    from checkbox_ng.launcher import LauncherDefinition
  File "/usr/lib/python3/dist-packages/checkbox_ng/launcher.py", line 30, in <module>
    from plainbox.impl.session.assistant import get_all_sa_flags
ImportError: cannot import name 'get_all_sa_flags'
narinder@narinder:~/Downloads$