changing title is not working

[ca77y]

1. change title in an article's json
2. run doctor

Running doctor task...
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.4/bin/zendesk-help-cms", line 9, in <module>
    load_entry_point('zendesk-helpcenter-cms==0.0.1', 'console_scripts', 'zendesk-help-cms')()
  File "/Users/Nico/src/zendesk-hekpcenter-cms/main.py", line 165, in main
    task.execute(options)
  File "/Users/Nico/src/zendesk-hekpcenter-cms/main.py", line 86, in execute
    categories = filesystem.loader(args['root_folder']).load()
  File "/Users/Nico/src/zendesk-hekpcenter-cms/filesystem.py", line 194, in load
    category = self._fill_category(category_name)
  File "/Users/Nico/src/zendesk-hekpcenter-cms/filesystem.py", line 173, in _fill_category
    self._fill_sections(category)
  File "/Users/Nico/src/zendesk-hekpcenter-cms/filesystem.py", line 181, in _fill_sections
    self._fill_articles(section)
  File "/Users/Nico/src/zendesk-hekpcenter-cms/filesystem.py", line 187, in _fill_articles
    article = self._load_article(section, article_name)
  File "/Users/Nico/src/zendesk-hekpcenter-cms/filesystem.py", line 119, in _load_article
    content = self.fs.read_json(content_path)
  File "/Users/Nico/src/zendesk-hekpcenter-cms/filesystem.py", line 45, in read_json
    return json.loads(text)
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/json/__init__.py", line 318, in loads
    return _default_decoder.decode(s)
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/json/decoder.py", line 343, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/json/decoder.py", line 361, in raw_decode
    raise ValueError(errmsg("Expecting value", s, err.value)) from None
ValueError: Expecting value: line 2 column 13 (char 14)