The API service fails to load with the error below.
The scheduler and share services seems to load fine. What could be wrong?
I compared api/versions.py for kilo and liberty. And it seems liberty is 
missing Versions class.
I appreciate your hep on this.

2015-10-28 15:39:58.458 8267 CRITICAL manila [-] ImportError: <module 
'manila.api.versions' from 
'/usr/lib/python2.7/site-packages/manila/api/versions.py'> has no 'Versions' 
attribute
2015-10-28 15:39:58.458 8267 ERROR manila Traceback (most recent call last):
2015-10-28 15:39:58.458 8267 ERROR manila   File "/usr/bin/manila-api", line 
10, in <module>
2015-10-28 15:39:58.458 8267 ERROR manila     sys.exit(main())
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/manila/cmd/api.py", line 48, in main
2015-10-28 15:39:58.458 8267 ERROR manila     server = 
service.WSGIService('osapi_share')
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/manila/service.py", line 276, in __init__
2015-10-28 15:39:58.458 8267 ERROR manila     self.app = 
self.loader.load_app(name)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/manila/wsgi.py", line 546, in load_app
2015-10-28 15:39:58.458 8267 ERROR manila     return deploy.loadapp("config:%s" 
% self.config_path, name=name)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 247, in 
loadapp
2015-10-28 15:39:58.458 8267 ERROR manila     return loadobj(APP, uri, 
name=name, **kw)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 272, in 
loadobj
2015-10-28 15:39:58.458 8267 ERROR manila     return context.create()
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 710, in create
2015-10-28 15:39:58.458 8267 ERROR manila     return 
self.object_type.invoke(self)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 144, in invoke
2015-10-28 15:39:58.458 8267 ERROR manila     **context.local_conf)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/util.py", line 56, in fix_call
2015-10-28 15:39:58.458 8267 ERROR manila     val = callable(*args, **kw)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/manila/api/__init__.py", line 35, in 
root_app_factory
2015-10-28 15:39:58.458 8267 ERROR manila     return 
paste.urlmap.urlmap_factory(loader, global_conf, **local_conf)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/urlmap.py", line 25, in urlmap_factory
2015-10-28 15:39:58.458 8267 ERROR manila     app = loader.get_app(app_name, 
global_conf=global_conf)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 350, in 
get_app
2015-10-28 15:39:58.458 8267 ERROR manila     name=name, 
global_conf=global_conf).create()
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 362, in 
app_context
2015-10-28 15:39:58.458 8267 ERROR manila     APP, name=name, 
global_conf=global_conf)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 450, in 
get_context
2015-10-28 15:39:58.458 8267 ERROR manila     global_additions=global_additions)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 559, in 
_pipeline_app_context
2015-10-28 15:39:58.458 8267 ERROR manila     APP, pipeline[-1], global_conf)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 458, in 
get_context
2015-10-28 15:39:58.458 8267 ERROR manila     section)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 517, in 
_context_from_explicit
2015-10-28 15:39:58.458 8267 ERROR manila     value = import_string(found_expr)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py", line 22, in 
import_string
2015-10-28 15:39:58.458 8267 ERROR manila     return 
pkg_resources.EntryPoint.parse("x=" + s).load(False)
2015-10-28 15:39:58.458 8267 ERROR manila   File 
"/usr/lib/python2.7/site-packages/pkg_resources.py", line 2265, in load
2015-10-28 15:39:58.458 8267 ERROR manila     raise ImportError("%r has no %r 
attribute" % (entry,attr))
2015-10-28 15:39:58.458 8267 ERROR manila ImportError: <module 
'manila.api.versions' from 
'/usr/lib/python2.7/site-packages/manila/api/versions.py'> has no 'Versions' 
attribute
2015-10-28 15:39:58.458 8267 ERROR manila 

Thanks,
Igor.
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