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hello ,everyone:
    compute node nova-network exception:


2011-11-18 22:35:35,910 ERROR nova.exception [-] DB exception wrapped.
(nova.exception): TRACE: Traceback (most recent call last):
(nova.exception): TRACE:   File
"/usr/lib/python2.7/dist-packages/nova/exception.py", line 78, in _wrap
(nova.exception): TRACE:     return f(*args, **kwargs)
(nova.exception): TRACE:   File
"/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1359, in
flush
(nova.exception): TRACE:     self._flush(objects)
(nova.exception): TRACE:   File
"/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 1447, in
_flush
(nova.exception): TRACE:     raise
(nova.exception): TRACE: TypeError: exceptions must be old-style classes or
derived from BaseException, not NoneType
(nova.exception): TRACE:
2011-11-18 22:35:35,911 ERROR nova [-] model server went away
(nova): TRACE: Traceback (most recent call last):
(nova): TRACE:   File "/usr/lib/python2.7/dist-packages/nova/service.py",
line 267, in report_state
(nova): TRACE:     {'report_count': service_ref['report_count'] + 1})
(nova): TRACE:   File "/usr/lib/python2.7/dist-packages/nova/db/api.py",
line 155, in service_update
(nova): TRACE:     return IMPL.service_update(context, service_id, values)
(nova): TRACE:   File
"/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 101, in
wrapper
(nova): TRACE:     return f(*args, **kwargs)
(nova): TRACE:   File
"/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/api.py", line 346, in
service_update
(nova): TRACE:     service_ref.save(session=session)
(nova): TRACE:   File
"/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/models.py", line 59,
in save
(nova): TRACE:     session.flush()
(nova): TRACE:   File "/usr/lib/python2.7/dist-packages/nova/exception.py",
line 81, in _wrap
(nova): TRACE:     raise DBError(e)
(nova): TRACE: DBError: exceptions must be old-style classes or derived
from BaseException, not NoneType
(nova): TRACE:
2011-11-18 22:35:45,948 ERROR nova [-] Recovered model server connection!


why ?
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