Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "nova/compute/__init__.py", line 25, in <module>
    nova.flags.FLAGS.compute_api_class)
  File "nova/openstack/common/importutils.py", line 33, in import_class
    (class_str, str(exc)))
ImportError: Class API cannot be found (Class API cannot be found (cannot import name log))