Hello, everything looks ok until i starting create an instance. During creation following error appears. Please advise.

Thank you

2016-11-27 16:05:57.623 28710 ERROR nova.utils [req-377a3a5f-e480-4a3c-8f83-2a3f7a102269 6294b1e81c324f24aaf0aeadfd2f5b12 09c35b4d0e87497ea2e5ec32059f6e7b - - -] [instance: 760e8f41-414b-4143-87a4-54090faf9672] Failed to spawn, rolling back
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672] Traceback (most recent call last):
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vmops.py", line 576, in _spawn
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     name_label)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vmops.py", line 127, in inner
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     rv = f(*args, **kwargs)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vmops.py", line 418, in create_disks_step
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     block_device_info)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vmops.py", line 357, in _get_vdis_for_instance
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     instance, name_label, image_meta.id, image_type)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vm_utils.py", line 1295, in create_image
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     image_type)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vm_utils.py", line 1255, in _create_cached_image
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     sr_ref)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 271, in inner
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     return f(*args, **kwargs)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vm_utils.py", line 1223, in _create_cached_image_impl
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     image_id, image_type)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vm_utils.py", line 1323, in _fetch_image
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     vdis = _fetch_vhd_image(context, session, instance, image_id)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/vm_utils.py", line 1406, in _fetch_vhd_image
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     vdis = handler.download_image(context, session, instance, image_id)
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]   File "/usr/lib/python2.7/site-packages/nova/virt/xenapi/image/glance.py", line 67, in download_image
2016-11-27 16:05:57.623 28710 ERROR nova.utils [instance: 760e8f41-414b-4143-87a4-54090faf9672]     'download_vhd2', params)
2016-11-27 16:05:57.623 28710 ...