When I am accessing my horizon I am getting internal server error 500.

In log file /var/log/apache2/error.log I got this error

 [:error] [pid 8639] [remote 192.168.1.10:49180] AppRegistryNotReady: The translation infrastructure cannot be initialized before the apps registry is ready. Check that you don't make non-lazy gettext calls at import time.

In log file /var/log/keystone/ keystone-all.log I got this error

2015-03-12 09:20:13.328 1677 WARNING keystone.openstack.common.versionutils [-] Deprecated: keystone.middleware.core.XmlBodyMiddleware is deprecated as of Icehouse in favor of support for "application/json" only and may be removed in K.
2015-03-12 09:20:25.167 1708 WARNING keystone.openstack.common.versionutils [-] Deprecated: keystone.middleware.core.XmlBodyMiddleware is deprecated as of Icehouse in favor of support for "application/json" only and may be removed in K.
2015-03-12 09:57:13.713 1137 WARNING keystone.openstack.common.versionutils [-] Deprecated: keystone.middleware.core.XmlBodyMiddleware is deprecated as of Icehouse in favor of support for "application/json" only and may be removed in K.