pyramid_mailer transaction traceback from Python 3.3

gistfile1.pytb

Traceback (most recent call last):
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid_debugtoolbar-1.0.3-py3.3.egg/pyramid_debugtoolbar/panels/performance.py", line 55, in resource_timer_handler
    result = handler(request)
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid-1.4-py3.3.egg/pyramid/tweens.py", line 21, in excview_tween
    response = handler(request)
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid_tm-0.7-py3.3.egg/pyramid_tm/__init__.py", line 82, in tm_tween
    reraise(*exc_info)
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid_tm-0.7-py3.3.egg/pyramid_tm/compat.py", line 13, in reraise
    raise value
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid_tm-0.7-py3.3.egg/pyramid_tm/__init__.py", line 63, in tm_tween
    response = handler(request)
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid-1.4-py3.3.egg/pyramid/router.py", line 161, in handle_request
    response = view_callable(context, request)
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid-1.4-py3.3.egg/pyramid/config/views.py", line 345, in rendered_view
    result = view(context, request)
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid-1.4-py3.3.egg/pyramid/config/views.py", line 465, in _class_requestonly_view
    response = inst()
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/pyramid_deform-0.2a5-py3.3.egg/pyramid_deform/__init__.py", line 69, in __call__
    result = success_method(validated)
  File "/Users/doug/Documents/devel/python/randopony-tetra/randopony/views/site/populaire.py", line 195, in register_success
    mailer.send_to_queue(message)
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/transaction-1.4.0b1-py3.3.egg/transaction/_manager.py", line 120, in __exit__
    self.commit()
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/transaction-1.4.0b1-py3.3.egg/transaction/_manager.py", line 111, in commit
    return self.get().commit()
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/transaction-1.4.0b1-py3.3.egg/transaction/_transaction.py", line 280, in commit
    reraise(t, v, tb)
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/transaction-1.4.0b1-py3.3.egg/transaction/_compat.py", line 55, in reraise
    raise value
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/transaction-1.4.0b1-py3.3.egg/transaction/_transaction.py", line 271, in commit
    self._commitResources()
  File "/Users/doug/.virtualenvs/randopony-tetra/lib/python3.3/site-packages/transaction-1.4.0b1-py3.3.egg/transaction/_transaction.py", line 386, in _commitResources
    L.sort(key=rm_key)
TypeError: unorderable types: int() < str()