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Adding solution here 2.5 years later - because I had same issue today. The dashboard is a django application that compiles a compressed javascript file, and for me, that javascript file wasn't compiled correctly.

Find your django application -- for me it is at /usr/share/openstack-dashboard -- and run this:

./ compress --force

then restart the web server (e.g. "service apache2 restart")

Also check the permissions in /usr/share/openstack-dashboard. You may want to change the owner to the account running the web server -- which could be "horizon", "www-data" or another account.