Thanks Nick, But I am still getting the same message. Because of this I am unable to install cbX studio on my PC I get following error what should I do?
I am 
creating content on edX Studio and deploying it on Google App Engine using cbX according to this video https://www.youtube.com/watch?v=jUfccP5Rl5M  but in Step 2 Set up of cbX following error come in git shell. what shell I do ? I am not a programmer so these things are little hard for me Please help me.
D:\eduself\coursebuilder_xblock_module-master> sh ./scripts/run_example.sh
INFO     2015-07-03 11:05:56,078 sdk_update_checker.py:241] Checking for updates
 to the SDK.
Traceback (most recent call last):
  File "../google_appengine/dev_appserver.py", line 201, in <module>
    _run_file(__file__, globals())
  File "../google_appengine/dev_appserver.py", line 197, in _run_file
    execfile(script_path, globals_)
  File "d:\eduself\coursebuilder_xblock_module-master\examples\google_appengine\
google\appengine\tools\devappserver2\devappserver2.py", line 887, in <module>
    main()
  File "d:\eduself\coursebuilder_xblock_module-master\examples\google_appengine\
google\appengine\tools\devappserver2\devappserver2.py", line 880, in main
    dev_server.start(options)
  File "d:\eduself\coursebuilder_xblock_module-master\examples\google_appengine\
google\appengine\tools\devappserver2\devappserver2.py", line 673, in start
    update_checker.check_for_updates(configuration)
  File "d:\eduself\coursebuilder_xblock_module-master\examples\google_appengine\
google\appengine\tools\devappserver2\update_checker.py", line 91, in check_for_u
pdates
    update_check.CheckForUpdates()
  File "d:\eduself\coursebuilder_xblock_module-master\examples\google_appengine\
google\appengine\tools\sdk_update_checker.py", line 255, in CheckForUpdates
    runtime=runtime))
  File "d:\eduself\coursebuilder_xblock_module-master\examples\google_appengine\
google\appengine\tools\appengine_rpc.py", line 409, in Send
    f = self.opener.open(req)
  File "c:\Python27\lib\urllib2.py", line 431, in open
    response = self._open(req, data)
  File "c:\Python27\lib\urllib2.py", line 449, in _open
    '_open', req)
  File "c:\Python27\lib\urllib2.py", line 409, in _call_chain
    result = func(*args)
  File "c:\Python27\lib\urllib2.py", line 1240, in https_open
    context=self._context)
TypeError: do_open() got an unexpected keyword argument 'context'
D:\eduself\coursebuilder_xblock_module-master>