Unexpected error in parsing json

Using the tutorial given here, I am making an app to fetch json data from a URL and display it. I am using this code to call the URL and parse.

{
                    xtype: 'nestedlist',
                    title: 'Blog',
                    iconCls: 'star',
                    cls: 'blog',
                    displayField: 'title',

                    store: {
                        type: 'tree',

                        fields: ['uuid', 'display'


                        ],

                        root: {
                            leaf: false
                        },

                        proxy: {
                            type: 'scripttag',
                            url: 'http://localhost:8081/openmrs-standalone/ws/rest/v1/location',
                            reader: {
                                type: 'json',
                                rootProperty: 'results'
                            }
                        },

                    },

                },

In the console i am getting response in the form

{
    "results": [
        {
            "uuid": "c0937f0c-1691-11df-97a5-7038c432aabf",
            "display": "Chulaimbo",
            "links": [
                {
                    "uri": "http://localhost:8081/openmrs-standalone/ws/rest/v1/location/c0937f0c-1691-11df-97a5-7038c432aabf",
                    "rel": "self"
                }
            ]
        },
        {
            "uuid": "c0937d4f-1691-11df-97a5-7038c432aabf",
            "display": "Mosoriot Hospital",
            "links": [
                {
                    "uri": "http://localhost:8081/openmrs-standalone/ws/rest/v1/location/c0937d4f-1691-11df-97a5-7038c432aabf",
                    "rel": "self"
                }
            ]
        },
        {
            "uuid": "8d6c993e-c2cc-11de-8d13-0010c6dffd0f",
            "display": "Unknown Location",
            "links": [
                {
                    "uri": "http://localhost:8081/openmrs-standalone/ws/rest/v1/location/8d6c993e-c2cc-11de-8d13-0010c6dffd0f",
                    "rel": "self"
                }
            ]
        }


    ]
}

but its showing an error "location" is the name of the service.

I have done it using a different method. I used proxytype 'rest' and run OpenMRS and my application on the same server and port otherwse my instance of OpenMRS wont allow cross-domain calls. The problem in this question was using type as "scripttag" which i still dont know what is the problem with it.Using "rest" resolves it.