File "/home/ubuntu/virtualenvs/venv-3.4.3/lib/python3.4/site-packages/urbanairship/push/core.py", line 49, in send
version=3
File "/home/ubuntu/virtualenvs/venv-3.4.3/lib/python3.4/site-packages/urbanairship/core.py", line 65, in _request
raise common.AirshipFailure.from_response(response)
File "/home/ubuntu/virtualenvs/venv-3.4.3/lib/python3.4/site-packages/urbanairship/common.py", line 75, in from_response
response.status_code, error_code, error, json.dumps(details))
File "/opt/circleci/python/3.4.3/lib/python3.4/json/__init__.py", line 230, in dumps
return _default_encoder.encode(obj)
File "/opt/circleci/python/3.4.3/lib/python3.4/json/encoder.py", line 192, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/opt/circleci/python/3.4.3/lib/python3.4/json/encoder.py", line 250, in iterencode
return _iterencode(o, 0)
File "/opt/circleci/python/3.4.3/lib/python3.4/json/encoder.py", line 173, in default
raise TypeError(repr(o) + " is not JSON serializable")
nose.proxy.TypeError: b'Error 503: Your request could not be completed, please retry.' is not JSON serializable