Necesito ejecutar la aplicación Django usando gunicorn. Leo la documentación y creo que configuro todo como debería, pero cuando ejecuto

gunicorn --worker-class socketio.sgunicorn.GeventSocketIOWorker app.wsgi:application

Me sale el siguiente mensaje de error

2013-02-01 18:25:17 [25394] [INFO] Booting worker with pid: 25394
2013-02-01 18:25:18 [25394] [ERROR] Exception in worker process:
Traceback (most recent call last):
  File ".../app-root/data/lib/python2.7/site-packages/gunicorn/arbiter.py", line 485, in spawn_worker
    worker.init_process()
  File ".../app-root/data/lib/python2.7/site-packages/gunicorn/workers/ggevent.py", line 131, in init_process
    super(GeventWorker, self).init_process()
  File ".../app-root/data/lib/python2.7/site-packages/gunicorn/workers/base.py", line 104, in init_process
    self.run()
  File ".../app-root/data/lib/python2.7/site-packages/socketio/sgunicorn.py", line 14, in run
    self.socket.setblocking(1)
AttributeError: 'GeventSocketIOWorker' object has no attribute 'socket'
Traceback (most recent call last):
  File ".../app-root/data/lib/python2.7/site-packages/gunicorn/arbiter.py", line 485, in spawn_worker
    worker.init_process()
  File ".../data/lib/python2.7/site-packages/gunicorn/workers/ggevent.py", line 131, in init_process
    super(GeventWorker, self).init_process()
  File ".../app-root/data/lib/python2.7/site-packages/gunicorn/workers/base.py", line 104, in init_process
    self.run()
  File ".../app-root/data/lib/python2.7/site-packages/socketio/sgunicorn.py", line 14, in run
    self.socket.setblocking(1)
AttributeError: 'GeventSocketIOWorker' object has no attribute 'socket'
2013-02-01 18:25:18 [25394] [INFO] Worker exiting (pid: 25394)

Si lo ejecuto con django_socketio, todo funciona bien, debo perder algo realmente importante.

Gracias por tu ayuda