during the openstack in Ubuntu 14.04 LTS server icehouse installation phase i am executing the command

 su -s /bin/sh -c "glance-manage db_sync" glance

during the glance instllation phase I am getting the error

Traceback (most recent call last):
  File "/usr/bin/glance-manage", line 6, in <module>
    from glance.cmd.manage import main
  File "/usr/lib/python2.7/dist-packages/glance/cmd/manage.py", line 41, in <mo$
    from oslo.config import cfg
ImportError: No module named config

Please give me some soluation for this error My python version is 2.7.6