Transient error with "Create new revision" step, import boto

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Last night we were unable to do new deployments through CircleCI. We had no problems earlier and it seems to have resolved itself this morning. It was failing on a “Create new revision” step, with this stack trace:

create_application_revision /tmp/codedeploy_applications.json /tmp/codedeploy_revisions.json
Traceback (most recent call last):
  File "/usr/local/bin/create_application_revision", line 9, in <module>
    load_entry_point('circle-sds-support==0.8.2', 'console_scripts', 'create_application_revision')()
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 351, in load_entry_point
    """Does the package's distribution contain the named metadata?"""
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 2363, in load_entry_point
    return
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 2088, in load
    return urlunparse(parsed[:-1] + ('',))
  File "/usr/local/lib/python2.7/dist-packages/circlesds/__init__.py", line 13, in <module>
    import circlesds.aws.sds as sds
  File "/usr/local/lib/python2.7/dist-packages/circlesds/aws/sds.py", line 11, in <module>
    import circlesds.aws.s3 as s3
  File "/usr/local/lib/python2.7/dist-packages/circlesds/aws/s3.py", line 3, in <module>
    import boto
  File "/usr/local/lib/python2.7/dist-packages/boto/__init__.py", line 28, in <module>
    from boto.storage_uri import BucketStorageUri, FileStorageUri
  File "/usr/local/lib/python2.7/dist-packages/boto/storage_uri.py", line 27, in <module>
    from boto.s3.deletemarker import DeleteMarker
  File "/usr/local/lib/python2.7/dist-packages/boto/s3/__init__.py", line 26, in <module>
    from boto.regioninfo import RegionInfo, get_regions
  File "/usr/local/lib/python2.7/dist-packages/boto/regioninfo.py", line 28, in <module>
    from boto.endpoints import BotoEndpointResolver
  File "/usr/local/lib/python2.7/dist-packages/boto/endpoints.py", line 13, in <module>
    import boto.vendored.regions.regions as _regions
ImportError: No module named regions.regions

((create_application_revision "/tmp/codedeploy_applications.json" "/tmp/codedeploy_revisions.json")) returned exit code 1

Action failed: Create new revision of apiserver

Any idea what could have caused this?