[I 11:39:37.196 NotebookApp] Running pdflatex 3 times: [u'pdflatex', u'notebook.tex']
[C 11:39:37.631 NotebookApp] pdflatex failed: [u'pdflatex', u'notebook.tex']
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    Transcript written on notebook.log.

[W 11:39:37.635 NotebookApp] 500 GET /nbconvert/pdf/hw1.ipynb?download=true (::1): nbconvert failed: PDF creating failed
[E 11:39:37.665 NotebookApp] Exception in exception handler
    Traceback (most recent call last):
      File "//anaconda/lib/python2.7/site-packages/tornado/web.py", line 1450, in _execute
        self._handle_request_exception(e)
      File "//anaconda/lib/python2.7/site-packages/tornado/web.py", line 1502, in _handle_request_exception
        self.send_error(e.status_code, exc_info=sys.exc_info())
      File "//anaconda/lib/python2.7/site-packages/tornado/web.py", line 978, in send_error
        self.finish()
      File "//anaconda/lib/python2.7/site-packages/tornado/web.py", line 934, in finish
        self._log()
      File "//anaconda/lib/python2.7/site-packages/tornado/web.py", line 1474, in _log
        self.application.log_request(self)
      File "//anaconda/lib/python2.7/site-packages/tornado/web.py", line 1936, in log_request
        self.settings["log_function"](handler)
      File "//anaconda/lib/python2.7/site-packages/notebook/log.py", line 46, in log_request
        log_method(json.dumps(request.headers, indent=2))
      File "//anaconda/lib/python2.7/json/__init__.py", line 251, in dumps
        sort_keys=sort_keys, **kw).encode(obj)
      File "//anaconda/lib/python2.7/json/encoder.py", line 209, in encode
        chunks = list(chunks)
      File "//anaconda/lib/python2.7/json/encoder.py", line 442, in _iterencode
        o = _default(o)
      File "//anaconda/lib/python2.7/json/encoder.py", line 184, in default
        raise TypeError(repr(o) + " is not JSON serializable")
    TypeError: <tornado.httputil.HTTPHeaders object at 0x1047fd950> is not JSON serializable