About Convert JSON file to Infotable

I follow the document: https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS179012 to convert JSON file to Infotable, so I:

1. Create the Datashape based on the JSON key and value.

2. Create the service to getJSON file, and the code is:

var params = {

proxyScheme: undefined /* STRING */,

headers: undefined /* JSON */,

ignoreSSLErrors: true /* BOOLEAN */,

useNTLM: undefined /* BOOLEAN */,

workstation: undefined /* STRING */,

useProxy: undefined /* BOOLEAN */,

withCookies: undefined /* BOOLEAN */,

proxyHost: undefined /* STRING */,

url:"http://servername/rest/sql/list/site/",

timeout: undefined /* NUMBER */,

proxyPort: undefined /* INTEGER */,

password: undefined /* STRING */,

domain: undefined /* STRING */,

username: undefined /* STRING */

};

// result: JSON

var data = Resources["ContentLoaderFunctions"].GetJSON(params);

var params = {

infoTableName: undefined /* STRING */,

dataShapeName: "TestJSON" /* DATASHAPENAME */

};

// result: INFOTABLE

var jsonTable = Resources["InfoTableFunctions"].CreateInfoTableFromDataShape(params);

for(var i=0;i<data.length;i++)

{

    jsonTable.AddRow({id:data.array.id, area:data.array.area, group:data.array.group, WS_name:data.array.WS_name, state:data.array.state, child:data.array.child});

}

//}

result = jsonTable;

3. After save and test, the result is an empty infotable.

Can anyone help?