Open Stack

I after install dashboard while i got error

systemctl status   httpd.service -l
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor
preset: disabled)
  Drop-In: /usr/lib/systemd/system/httpd.service.d
           └─openstack-dashboard.conf
   Active: failed (Result: exit-code) since 日 2016-09-18 19:11:52 CST; 14s
ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 50843 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited,
status=0/SUCCESS)
  Process: 58465 ExecStartPre=/usr/bin/python
/usr/share/openstack-dashboard/manage.py
compress --force (code=exited, status=1/FAILURE)
  Process: 58458 ExecStartPre=/usr/bin/python
/usr/share/openstack-dashboard/manage.py
collectstatic --noinput --clear (code=exited, status=0/SUCCESS)
 Main PID: 34243 (code=exited, status=0/SUCCESS)

9月 18 19:11:52 controller python[58465]: CommandError: An error occurred
during rendering
/usr/share/openstack-dashboard/openstack_dashboard/templates/_stylesheets.html:
/bin/sh: django_pyscss.compressor.DjangoScssFilter: command not found
9月 18 19:11:52 controller python[58465]: Found 'compress' tags in:
9月 18 19:11:52 controller python[58465]: /usr/lib/python2.7/site-
packages/horizon/templates/horizon/_conf.html
9月 18 19:11:52 controller python[58465]: /usr/share/openstack-
dashboard/openstack_dashboard/templates/_stylesheets.html
9月 18 19:11:52 controller python[58465]: /usr/lib/python2.7/site-
packages/horizon/templates/horizon/_scripts.html
9月 18 19:11:52 controller python[58465]: Compressing...
9月 18 19:11:52 controller systemd[1]: httpd.service: control process
exited, code=exited status=1
9月 18 19:11:52 controller systemd[1]: Failed to start The Apache HTTP
Server.
9月 18 19:11:52 controller systemd[1]: Unit httpd.service entered failed
state.
9月 18 19:11:52 controller systemd[1]: httpd.service failed.



how to  resolve?
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