Horizon rendering failed at Compression

[Duong Ha-Quang]

When deploy OPS, the deployment is successful but Horizon lost all stylesheet and images.

log fragment:

Found 'compress' tags in:
 /var/lib/kolla/venv/lib/python2.7/site-packages/openstack_dashboard/templates/horizon/_conf.html
 /var/lib/kolla/venv/lib/python2.7/site-packages/openstack_dashboard/templates/_stylesheets.html
 /var/lib/kolla/venv/lib/python2.7/site-packages/openstack_dashboard/templates/horizon/_scripts.html
Compressing... CommandError: An error occurred during rendering /var/lib/kolla/venv/lib/python2.7/site-packages/openstack_dashboard/templates/_stylesheets.html: Couldn't find anything to import: ../../mixins
Extensions: <NamespaceAdapterExtension>, <DjangoExtension>, <CompassExtension>
Search path:

on line 21 of horizon/lib/roboto_fontface/css/roboto/sass/roboto-fontface-regular.scss
imported from line 21 of horizon/lib/roboto_fontface/css/roboto/sass/roboto-fontface.scss
imported from line 16 of themes/material/bootstrap/_styles.scss
imported from line 16 of themes/material/_styles.scss
imported from line 1 of u'string:c61b5d22d54bf56c:\n // My Themes\n@import "/themes/material/variables";\n\n// Horizon\n@import "/dashboard/scss/horizon'

[Eduardo Gonzalez (egonzalez90)]

Bug from Horizon side. https://bugs.launchpad.net/horizon/+bug/1645630