Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instance 7d90eb80-29e2-4238-b658-ade407ff9456. Last exception: [u'Traceback (most recent call last): ', u' File "/usr/lib/py

Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instance 7d90eb80-29e2-4238-b658-ade407ff9456. Last exception: [u'Traceback (most recent call last): ', u' File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1].