transmissionrpc encoding error

>>> transmissionrpc.Client()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "C:\Python27\lib\site-packages\transmissionrpc\client.py", line 169, in __init__
    self.get_session()
  File "C:\Python27\lib\site-packages\transmissionrpc\client.py", line 819, in get_session
    self._request('session-get', timeout=timeout)
  File "C:\Python27\lib\site-packages\transmissionrpc\client.py", line 247, in _request
    http_data = self._http_query(query, timeout)
  File "C:\Python27\lib\site-packages\transmissionrpc\client.py", line 222, in _http_query
    debug_httperror(error)
  File "C:\Python27\lib\site-packages\transmissionrpc\client.py", line 44, in debug_httperror
    indent=2
  File "C:\Python27\lib\json\__init__.py", line 238, in dumps
    **kw).encode(obj)
  File "C:\Python27\lib\json\encoder.py", line 203, in encode
    chunks = list(chunks)
  File "C:\Python27\lib\json\encoder.py", line 428, in _iterencode
    for chunk in _iterencode_dict(o, _current_indent_level):
  File "C:\Python27\lib\json\encoder.py", line 402, in _iterencode_dict
    for chunk in chunks:
  File "C:\Python27\lib\json\encoder.py", line 384, in _iterencode_dict
    yield _encoder(value)
UnicodeDecodeError: 'utf8' codec can't decode byte 0x92 in position 18: invalid start byte