deluge log file

[DEBUG   ] 07:42:00 server:156 uploading files to /tmp/delugeweb-H9hIE5
[DEBUG   ] 07:42:00 server:164 uploaded 1 file(s)
[DEBUG   ] 07:42:01 json_api:254 json-request: {"method":"web.get_torrent_info","params":["/tmp/delugeweb-H9hIE5/tmp16RqUu.torrent"],"id":34}
[DEBUG   ] 07:42:01 common:68 Attempting to open /tmp/delugeweb-H9hIE5/tmp16RqUu.torrent.
[ERROR   ] 07:42:01 json_api:270 'utf8' codec can't decode byte 0xc7 in position 1: invalid continuation byte
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/deluge/ui/web/json_api.py", line 292, in render
    d = self._on_json_request(request)
  File "/usr/lib64/python2.7/site-packages/deluge/ui/web/json_api.py", line 264, in _on_json_request
    return self._send_response(request, response)
  File "/usr/lib64/python2.7/site-packages/deluge/ui/web/json_api.py", line 275, in _send_response
    response = json.dumps(response)
  File "/usr/lib64/python2.7/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/usr/lib64/python2.7/json/encoder.py", line 201, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib64/python2.7/json/encoder.py", line 264, in iterencode
    return _iterencode(o, 0)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xc7 in position 1: invalid continuation byte