openstack and ceph cannot attach volumes

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I have the following installed
- openstack grizzly
- ceph cuttlefish

and followed
http://ceph.com/docs/master/rbd/rbd-openstack/

i can create volumes and i see them in ceph with the apporiate id's
but when i wan to attach them to a instance i get a error

2013-06-03 12:22:35.563 AUDIT nova.compute.manager [req-cfda1cf6-c1aa-40f0-9a5c-b9da61979c47 529a2c1a5f924206a9d82c7a86846a0d 7cc8d4da86534c4792a6839ac2927a9a] [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee4$
2013-06-03 12:22:35.725 ERROR nova.compute.manager [req-cfda1cf6-c1aa-40f0-9a5c-b9da61979c47 529a2c1a5f924206a9d82c7a86846a0d 7cc8d4da86534c4792a6839ac2927a9a] [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee4$
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49] Traceback (most recent call last):
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2859, in _attach_volume
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]     mountpoint)
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 981, in attach_volume
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]     disk_dev)
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]     self.gen.next()
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 968, in attach_volume
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]     virt_dom.attachDeviceFlags(conf.to_xml(), flags)
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/config.py", line 68, in to_xml
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]     root = self.format_dom()
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/config.py", line 507, in format_dom
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]     auth.set("username", self.auth_username)
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "lxml.etree.pyx", line 695, in lxml.etree._Element.set (src/lxml/lxml.etree.c:35440)
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "apihelpers.pxi", line 563, in lxml.etree._setAttributeValue (src/lxml/lxml.etree.c:15471)
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]   File "apihelpers.pxi", line 1364, in lxml.etree._utf8 (src/lxml/lxml.etree.c:22039)
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49] TypeError: Argument must be bytes or unicode, got 'NoneType'
2013-06-03 12:22:35.725 23702 TRACE nova.compute.manager [instance: b4bd7311-d4aa-402a-898d-c20ba4d1ee49]


does anyone know what might be the problem?

greetz
Ramonskie ********************************************************
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