The error "ValueError: No JSON object could be decoded" should say what the object is

Is it an invalid file, or something received from the network? Which site does it relate to?

Currently, the error is:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/gevent/greenlet.py", line 536, in run
    result = self._run(*self.args, **self.kwargs)
  File "/usr/local/share/zeronet/src/Site/Site.py", line 402, in update
    file_info = self.content_manager.getFileInfo(bad_file)
  File "/usr/local/share/zeronet/src/Content/ContentManager.py", line 319, in getFileInfo
    content = self.contents.get(content_inner_path.strip("/"))
  File "/usr/local/share/zeronet/src/Content/ContentDbDict.py", line 105, in get
    return self.__getitem__(key)
  File "/usr/local/share/zeronet/src/Content/ContentDbDict.py", line 55, in __getitem__
    return self.loadItem(key)
  File "/usr/local/share/zeronet/src/Content/ContentDbDict.py", line 23, in loadItem
    content = self.site.storage.loadJson(key)
  File "/usr/local/share/zeronet/src/Site/SiteStorage.py", line 254, in loadJson
    return json.load(file)
  File "/usr/local/lib/python2.7/json/__init__.py", line 291, in load
    **kw)
  File "/usr/local/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/usr/local/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/lib/python2.7/json/decoder.py", line 382, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded