service nova-manage cannot be running

CRITICAL nova [-] f(ile) should be int ,str, unicode or file ,not <open GreenPipe '<fd:5>',mode 'wb' at 0x8dc2dac>

File "/usr/lib/pymodules/python2.6/eventlet/greeio.py",line 376,in __init__
TypeError: f(ile) should be int ,str, unicode or file ,not <open GreenPipe '<fd:5>',mode 'wb' at 0x8dc2dac>

itis the nova-network.log.

and it is my nova.conf :
--dhcpbridge_flagfile=/etc/nova/nova.conf
--dhcpbridge=/usr/bin/nova-dhcpbridge
--logdir=/var/log/nova
--state_path=/var/lib/nova
--verbose
--cc_host=192.168.60.150
--s3_host=192.168.60.150
--rabbit_host=192.168.60.150
--ec2_host=192.168.60.150
--ec2_url=http://192.168.60.150:8773/services/Cloud
--fixed_range=192.168.60.0/12
--network_size=8
--routing_source_ip=192.168.60.150
--sql_connection=mysql://root:nova@192.168.60.150/nova
--network_manager=nova.network.manager.VlanManager