'Toolbox' object has no attribute 'CORS'

I've created an AngularJS web app, being served by a CherryPy server. It's 
calling an API which returns a JSON response

The server.py (of my web application, not the API server) file looks like 
this

import os
import cherrypy

from cherrypy.lib.static import serve_file

class Root(object):
   pass
  
if __name__ == '__main__':
    root = os.path.dirname(os.path.abspath(__file__))  # this file's 
directory

    cherrypy.config.update( {
        'server.socket_host': '0.0.0.0',
        'server.socket_port': 8010,
    } )

    conf = {
        '/': {
            'tools.staticdir.on': True,
            'tools.staticdir.root' : root,
            'tools.staticdir.dir': root + '/public/',
            'tools.staticdir.index': root + '/public/app/views/index.html',
            'tools.CORS.on': True
        }
    }

 

    cherrypy.quickstart(Root(), '/', conf)


However, when my angular app tries to hit the URI I get the following error

[22/Mar/2016:15:28:28] ENGINE Bus STARTING
CherryPy Checker:
The config entry 'tools.CORS.on' may be invalid, because the 'CORS' tool 
was not found.
section: [/]

 

AttributeError: 'Toolbox' object has no attribute 'CORS'


Any clue as to what I'm doing wrong? 

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