What specifically should I be catching in order to properly handle the
following item that appears in my stacktrace?  Where do I import this
exception (Error) from?  This error occurs intermittently.


          Error: An error occurred for the API request
datastore_v3.RunQuery().


The full stacktrace is:

  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 1382, in get
    results = self.fetch(1)
  File "/base/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 1426, in fetch
    raw = self._get_query().Get(limit, offset)
  File "/base/python_lib/versions/1/google/appengine/api/
datastore.py", line 959, in Get
    return self._Run(limit, offset)._Get(limit)
  File "/base/python_lib/versions/1/google/appengine/api/
datastore.py", line 900, in _Run
    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'RunQuery', pb,
result)
  File "/base/python_lib/versions/1/google/appengine/api/
apiproxy_stub_map.py", line 72, in MakeSyncCall
    apiproxy.MakeSyncCall(service, call, request, response)
  File "/base/python_lib/versions/1/google/appengine/api/
apiproxy_stub_map.py", line 244, in MakeSyncCall
    stub.MakeSyncCall(service, call, request, response)
  File "/base/data/home/apps/tw3/16.335384870848503913/twa/
datastore_cache.py", line 66, in MakeSyncCall
    self.CallWrappedStub(call, request, response)
  File "/base/data/home/apps/tw3/16.335384870848503913/twa/
datastore_cache.py", line 54, in CallWrappedStub
    self._wrapped_stub.MakeSyncCall(self.SERVICE_NAME, call, request,
response)
  File "/base/python_lib/versions/1/google/appengine/runtime/
apiproxy.py", line 183, in MakeSyncCall
    rpc.CheckSuccess()
  File "/base/python_lib/versions/1/google/appengine/api/
apiproxy_rpc.py", line 110, in CheckSuccess
    raise self.exception
Error: An error occurred for the API request datastore_v3.RunQuery().
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