Comment 8 for bug 921774

In glance-api log you can find source for this error:

Registry request PUT /images/72479ffc-34cd-42e3-b6f2-d8f13784b6d6 Exception
2012-09-05 11:02:04 TRACE glance.registry.client Traceback (most recent call last):
2012-09-05 11:02:04 TRACE glance.registry.client File "/opt/stack/glance/glance/registry/client.py", line 89, in do_request
2012-09-05 11:02:04 TRACE glance.registry.client action, **kwargs)
2012-09-05 11:02:04 TRACE glance.registry.client File "/opt/stack/glance/glance/common/client.py", line 63, in wrapped
2012-09-05 11:02:04 TRACE glance.registry.client return func(self, *args, **kwargs)
2012-09-05 11:02:04 TRACE glance.registry.client File "/opt/stack/glance/glance/common/client.py", line 444, in do_request
2012-09-05 11:02:04 TRACE glance.registry.client headers=headers)
2012-09-05 11:02:04 TRACE glance.registry.client File "/opt/stack/glance/glance/common/client.py", line 80, in wrapped
2012-09-05 11:02:04 TRACE glance.registry.client return func(self, method, url, body, headers)
2012-09-05 11:02:04 TRACE glance.registry.client File "/opt/stack/glance/glance/common/client.py", line 574, in _do_request
2012-09-05 11:02:04 TRACE glance.registry.client raise exception.Invalid(res.read())
2012-09-05 11:02:04 TRACE glance.registry.client Invalid: 400 Bad Request
2012-09-05 11:02:04 TRACE glance.registry.client
2012-09-05 11:02:04 TRACE glance.registry.client The server could not comply with the request since it is either malformed or otherwise incorrect.
2012-09-05 11:02:04 TRACE glance.registry.client
2012-09-05 11:02:04 TRACE glance.registry.client Failed to update image metadata. Got error: Invalid container format 'None' for image.
2012-09-05 11:02:04 TRACE glance.registry.client
2012-09-05 11:02:04 ERROR glance.api.v1.images [bfbcbd08-4431-46f6-8b45-f1efa292cd20 f21327bf650349f1af4c744399617b14 ee9a7e206b454b61a66e6386d596f796] Failed to activate image. Got error: 400 Bad Request
Failed to activate image. Got error: 400 Bad Request