Cocos2d-x on Mac - Mavericks - can't install

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#1

I’ve been trying to install Cocos2d-x on my mac to no avail. I have cocos2d already installed so I am familiar with the process. I am trying to follow this guide - http://www.cocos2d-x.org/wiki/How_to_create_a_multi-platform_project_in_one_command_line. However when I try to install via the terminal I get an error.

mark-potokas-macbook-pro:cocos2d-x markpotoka$ ./create-multi-platform-projects.py -p MyGame -k com.MyCompany.AwesomeGame -l cpp
Traceback (most recent call last):
  File "./create-multi-platform-projects.py", line 5, in 
    from tools.project_creator import create_project
  File "/Users/markpotoka/Downloads/IPHONEDEV/cocos2d-x-3.0alpha0/tools/project_creator/create_project.py", line 18, in 
ImportError: No module named json

I am using cocos2d-x v. 3.3 alpha - and I am using Xcode 5. Any help would be much appreciated.