title: ipython server can't launch: No module named notebook.notebookapp
body: <p>I've been trying to setup an ipython server following several tutorials (since none was exactly my case). A couple days ago, I did manage to get it to the point where it was launching but then was not able to access it via url. Today it's not launching anymore and I can't find much about this specific error I get:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/local/bin/ipython", line 9, in &lt;module&gt;
      load_entry_point('ipython==4.0.0-dev', 'console_scripts', 'ipython')()
    File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/__init__.py", line 118, in start_ipython
      return launch_new_instance(argv=argv, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 591, in launch_instance
      app.initialize(argv)
    File "&lt;string&gt;", line 2, in initialize
    File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error
      return method(app, *args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/terminal/ipapp.py", line 302, in initialize
      super(TerminalIPythonApp, self).initialize(argv)
    File "&lt;string&gt;", line 2, in initialize
    File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error
      return method(app, *args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/core/application.py", line 386, in initialize
      self.parse_command_line(argv)
    File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/terminal/ipapp.py", line 297, in parse_command_line
      return super(TerminalIPythonApp, self).parse_command_line(argv)
    File "&lt;string&gt;", line 2, in parse_command_line
    File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error
      return method(app, *args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 487, in parse_command_line
      return self.initialize_subcommand(subc, subargv)
    File "&lt;string&gt;", line 2, in initialize_subcommand
    File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error
      return method(app, *args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 418, in initialize_subcommand
      subapp = import_item(subapp)
    File "build/bdist.linux-x86_64/egg/ipython_genutils/importstring.py", line 31, in import_item
  ImportError: No module named notebook.notebookapp
  </code></pre>
  
  <p>So about the setup, I have installed the anaconda distrib of ipython, pyzmq &amp; tornado libraries. I have created a profile nbserver and the config file is as follows - ipython.config.py:</p>
  
  <pre><code>c = get_config()
  c.IPKernalApp.pylab = 'inline'
  c.NotebookApp.certfile = u'/home/ludo/.ipython/profile_nbserver/mycert.pem'
  c.NotebookApp.ip = '*'
  c.NotebookApp.open_browser = False
  c.NotebookApp.password = u'sha1:e6cb2aa9a[...]'
  c.NotebookApp.port = 9999
  c.NotebookManager.notebook_dir = u'/var/www/ipynb/'
  c.NotebookApp.base_project_url = '/ipynb/'
  c.NotebookApp.base_kernel_url = '/ipynb/'
  c.NotebookApp.webapp_settings = {'static_url_prefix':'/ipynb/static/'}
  </code></pre>
  
  <p>I really don't know where to look for clues anymore - and I'm probably lacking a greater understanding of how all this works to figure it out. My ultimate goal is to then use the answer to <a href="https://stackoverflow.com/questions/23890386/how-to-run-ipython-behind-an-apache-proxy">this question</a> on SO to complete a setup behind apache and eventually connect it to colaboratory - but seems like it should launch first.</p>
  
  <p>Many thanks for any help :)</p>