title: traitlets.traitlets.TraitError in Pycharm
body: <p>I am a beginner in python. I am facing the following problem.</p>
  
  <p>Whenever I start pycharm Community edition (version 5.0.3), the Python console fails to starts and shows the following error:</p>
  
  <pre><code>usr/bin/python2.7 /usr/lib/pycharm-community/helpers/pydev/pydevconsole.py 53192 49994 
  Traceback (most recent call last):  
    File "/usr/lib/pycharm-community/helpers/pydev/pydevconsole.py", line 488, in &lt;module&gt;
      pydevconsole.StartServer(pydev_localhost.get_localhost(), int(port), int(client_port))
    File "/usr/lib/pycharm-community/helpers/pydev/pydevconsole.py", line 330, in StartServer
      interpreter = InterpreterInterface(host, client_port, threading.currentThread())
    File "/usr/lib/pycharm-community/helpers/pydev/pydev_ipython_console.py", line 26, in __init__
      self.interpreter = get_pydev_frontend(host, client_port)
    File "/usr/lib/pycharm-community/helpers/pydev/pydev_ipython_console_011.py", line 472, in get_pydev_frontend
      _PyDevFrontEndContainer._instance = _PyDevFrontEnd()
    File "/usr/lib/pycharm-community/helpers/pydev/pydev_ipython_console_011.py", line 303, in __init__
      self.ipython = PyDevTerminalInteractiveShell.instance()
    File "/usr/lib/python2.7/dist-packages/IPython/config/configurable.py", line 354, in instance
      inst = cls(*args, **kwargs)
    File "/usr/lib/python2.7/dist-packages/IPython/terminal/interactiveshell.py", line 328, in __init__
      **kwargs
    File "/usr/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 483, in __init__
      self.init_readline()
    File "/usr/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 1816, in init_readline
      if self.readline_use:
    File "/home/vivekruhela/.local/lib/python2.7/site-packages/traitlets/traitlets.py", line 529, in __get__
      return self.get(obj, cls)
    File "/home/vivekruhela/.local/lib/python2.7/site-packages/traitlets/traitlets.py", line 507, in get
      % (self.name, obj))
    traitlets.traitlets.TraitError: No default value found for None trait of &lt;pydev_ipython_console_011.PyDevTerminalInteractiveShell object at 0x7f7b0e682cd0&gt;
  
  Process finished with exit code 1
  Couldn't connect to console process.
  </code></pre>
  
  <p>How can I connect to the pycharm console? I have already installed IPython in my system.</p>