Throws Value error when trying to send a simple message v1.6.3

[harshatanguturi]

Traceback:

File "/usr/local/lib/python2.7/dist-packages/dyn/mm/message.py", line 22, in send_message
EMail(from_field, to, subject, cc, body, html, replyto, xheaders).send()
File "/usr/local/lib/python2.7/dist-packages/dyn/mm/message.py", line 85, in send
MMSession.get_session().execute(self.uri, 'POST', api_args)
File "/usr/local/lib/python2.7/dist-packages/dyn/core.py", line 313, in execute
self.logger.debug(msg.format(uri, method, clean_args(json.loads(args))))
File "/usr/lib/python2.7/json/init.py", line 338, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 384, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

[harshatanguturi]

And the same shows up for 1.8.0 as well