errores de python de Cuckoo Sandbox después del envío de la tarea

Soy nuevo en Cuckoo Sandbox. ¿Por qué estoy recibiendo este error? No entiendo. Si hay algo mal, ¿puede alguien explicar cómo configurar Cuckoo Sandbox? Mi configuración funciona muy bien antes de enviar cualquier tipo de cosa maliciosa. He estado trabajando en ello durante los últimos 5 días.

¡Gracias!

Cuckoo Sandbox 0.5
www.cuckoosandbox.org
 Copyright (c) 2010-2012
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2013-01-12 18:42:42,738 [lib.cuckoo.core.scheduler] INFO: Using "virtualbox" machine manager
2013-01-12 18:42:42,935 [lib.cuckoo.core.scheduler] INFO: Loaded 1 machine/s
2013-01-12 18:42:42,936 [lib.cuckoo.core.scheduler] INFO: Waiting for analysis tasks...
2013-01-12 18:43:12,403 [lib.cuckoo.core.scheduler] INFO: Starting analysis of URL 
"http://gamerpocket.com/temp/images/qeqynu.jpg" (task=2)
2013-01-12 18:43:12,433 [lib.cuckoo.core.scheduler] INFO: Task #2: acquired machine cuckoo1 (label=cuckoo1)
2013-01-12 18:43:12,466 [lib.cuckoo.core.sniffer] INFO: Started sniffer (interface=eth0, host=192.168.0.100, dump path=/opt/cuckoo/storage/analyses/2/dump.pcap)
2013-01-12 18:43:20,308 [lib.cuckoo.core.guest] INFO: Starting analysis on guest (id=cuckoo1, ip=192.168.0.100)
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner
    self.run()
  File "/opt/cuckoo/lib/cuckoo/core/scheduler.py", line 318, in run
    success = self.launch_analysis()
  File "/opt/cuckoo/lib/cuckoo/core/scheduler.py", line 240, in launch_analysis
    guest.start_analysis(options)
  File "/opt/cuckoo/lib/cuckoo/core/guest.py", line 136, in start_analysis
    self.wait(CUCKOO_GUEST_INIT)
  File "/opt/cuckoo/lib/cuckoo/core/guest.py", line 59, in wait
    self.server._set_timeout(self.timeout)
  File "/opt/cuckoo/lib/cuckoo/common/utils.py", line 107, in _set_timeout
    if t._connection[1] and t._connection[1].sock:
AttributeError: TimeoutTransport instance has no attribute '_connection'