In the RDO install I've set up heat. From horizon I can create a stack no problems. But previewing gives:

Internal Server Error: /dashboard/project/stacks/preview
 Traceback (most recent call last):
   File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", line 164, in get_response
     response = response.render()
   File "/usr/lib/python2.7/site-packages/django/template/response.py", line 158, in render
     self.content = self.rendered_content
   File "/usr/lib/python2.7/site-packages/django/template/response.py", line 135, in rendered_content
     content = template.render(context, self._request)
   File "/usr/lib/python2.7/site-packages/django/template/backends/django.py", line 74, in render
     return self.template.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 210, in render
     return self._render(context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 202, in _render
     return self.nodelist.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 905, in render
     bit = self.render_node(node, context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
     return node.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py", line 135, in render
     return compiled_parent._render(context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 202, in _render
     return self.nodelist.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 905, in render
     bit = self.render_node(node, context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
     return node.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py", line 65, in render
     result = block.nodelist.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 905, in render
     bit = self.render_node(node, context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
     return node.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/loader_tags.py", line 65, in render
     result = block.nodelist.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 905, in render
     bit = self.render_node(node, context)
   File "/usr/lib/python2.7/site-packages/django/template/base.py", line 919, in render_node
     return node.render(context)
   File "/usr/lib/python2.7/site-packages/django/template/defaulttags.py", line 507, in render
     six.reraise(*exc_info)
   File "/usr/lib/python2.7/site-packages/django/template/defaulttags.py", line 493, in render
     url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
   File "/usr/lib/python2.7/site-packages/django/core/urlresolvers.py", line 571, in reverse
     (key, ':'.join(resolved_path)))
 NoReverseMatch: u'stack' is not a registered namespace inside 'horizon:project'

Anyone with similar issues? Or some hints?