title: Cant Launch Jupyter Notebook
body: <p>Im still a newbie in anaconda, python and jupyter notebook. 
  I am doing my assignment which is exploring anaconda and jupyter.</p>
  
  <ul>
  <li>windows 10, 64bit</li>
  <li>python 3.6.4</li>
  <li>anaconda 4.4.10</li>
  </ul>
  
  <p>Why I cant launch jupyter notebook? First time i tried it was successful. And i continue with importing the libraries. Then, when the next time i open anaconda prompt and tried <code>jupyter notebook</code> , i got this error:</p>
  
  <blockquote>
    <p>Traceback (most recent call last):
      File "C:\Users\LENOVO\Anaconda3\lib\site-packages\pkg_resources__init__.py", line 2760, in get_entry_map
        ep_map = self._ep_map
      File "C:\Users\LENOVO\Anaconda3\lib\site-packages\pkg_resources__init__.py", line 2731, in <strong>getattr</strong>
        raise AttributeError(attr)
    AttributeError: _ep_map</p>
    
    <p>During handling of the above exception, another exception occurred:</p>
    
    <p>Traceback (most recent call last):
      File "C:\Users\LENOVO\Anaconda3\Scripts\jupyter-notebook-script.py", line 10, in 
        sys.exit(main())</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\jupyter_core\application.py", line 266, in launch_instance
        return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\traitlets\config\application.py", line 657, in launch_instance
        app.initialize(argv)</p>
    
    <p>File "", line 2, in initialize</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\traitlets\config\application.py", line 87, in catch_config_error
        return method(app, *args, **kwargs)</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 1507, in initialize
        self.init_webapp()</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 1270, in init_webapp
        self.jinja_environment_options</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 156, in <strong>init</strong>
        default_url, settings_overrides, jinja_env_options)</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 268, in init_settings
        nbextensions_path=jupyter_app.nbextensions_path,</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 973, in nbextensions_path
        from IPython.paths import get_ipython_dir</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\IPython__init__.py", line 55, in 
        from .terminal.embed import embed</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\IPython\terminal\embed.py", line 16, in 
        from IPython.terminal.interactiveshell import TerminalInteractiveShell</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\IPython\terminal\interactiveshell.py", line 91, in 
        class TerminalInteractiveShell(InteractiveShell):</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\IPython\terminal\interactiveshell.py", line 134, in TerminalInteractiveShell
        highlighting: \n %s""" % ', '.join(get_all_styles())</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\pygments\styles__init__.py", line 79, in get_all_styles
        for name, _ in find_plugin_styles():</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\pygments\plugin.py", line 62, in find_plugin_styles
        for entrypoint in iter_entry_points(STYLE_ENTRY_POINT):</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\pkg_resources__init__.py", line 737, in iter_entry_points
        entries = dist.get_entry_map(group)</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\pkg_resources__init__.py", line 2763, in get_entry_map
        self._get_metadata('entry_points.txt'), self</p>
    
    <p>File "C:\Users\LENOVO\Anaconda3\lib\site-packages\pkg_resources__init__.py", line 2496, in parse_map
        raise ValueError("Entry points must be listed in groups")
    ValueError: Entry points must be listed in groups</p>
  </blockquote>
  
  <p>Is a big thank you if anyone can help me solve this! :)
  Feel free to drop any comment/suggestion. Thank you!!</p>