cbepctl when connect to down node: AttributeError: error instance has no attribute 'errno'

http://qa.hq.northscale.net/view/2.0.1/job/centos-32-2.0-upgrade/20/consoleFull

[2013-01-21 01:45:42,873] - [remote_util:1206] INFO - running command.raw /opt/couchbase/bin/cbepctl 10.1.4.24:11210 -b default -p "" set flush_param exp_pager_stime 5
[2013-01-21 01:45:43,087] - [remote_util:1234] INFO - command executed successfully
[2013-01-21 01:45:43,088] - [remote_util:1179] ERROR - Traceback (most recent call last):
[2013-01-21 01:45:43,088] - [remote_util:1179] ERROR - File "/opt/couchbase/lib/python/cbepctl", line 176, in ?
[2013-01-21 01:45:43,088] - [remote_util:1179] ERROR - c.execute()
[2013-01-21 01:45:43,089] - [remote_util:1179] ERROR - File "/opt/couchbase/lib/python/clitool.py", line 63, in execute
[2013-01-21 01:45:43,089] - [remote_util:1179] ERROR - if type(e) is tuple and e[0] == 32 or \
[2013-01-21 01:45:43,089] - [remote_util:1179] ERROR - AttributeError: error instance has no attribute 'errno'

host: root@10.1.4.24
python -V
Python 2.4.3