The API call taskqueue.Add() was explicitly cancelled.
Traceback (most recent call last):
  File "/base/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 509, in __call__
    handler.post(*groups)
  File "/base/python_lib/versions/1/google/appengine/ext/deferred/deferred.py", line 254, in post
    run(self.request.body)
  File "/base/python_lib/versions/1/google/appengine/ext/deferred/deferred.py", line 123, in run
    return func(*args, **kwds)
  File "/base/python_lib/versions/1/google/appengine/ext/deferred/deferred.py", line 165, in invoke_member
    return getattr(obj, membername)(*args, **kwargs)
  File "/base/data/home/apps/biopredictive-hindex/2.337844461643359767/backoffice/machinery.py", line 91, in _continue
    deferred.defer(self._continue, start_key, batch_size, _queue='mapper')
  File "/base/python_lib/versions/1/google/appengine/ext/deferred/deferred.py", line 237, in defer
    task.add(queue)
  File "/base/python_lib/versions/1/google/appengine/api/labs/taskqueue/taskqueue.py", line 489, in add
    return Queue(queue_name).add(self, transactional=transactional)
  File "/base/python_lib/versions/1/google/appengine/api/labs/taskqueue/taskqueue.py", line 564, in add
    apiproxy_stub_map.MakeSyncCall(*call_tuple)
  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 266, in MakeSyncCall
    rpc.CheckSuccess()
  File "/base/python_lib/versions/1/google/appengine/api/apiproxy_rpc.py", line 111, in CheckSuccess
    raise self.exception
CancelledError: The API call taskqueue.Add() was explicitly cancelled.