Unable to Parse the XML

Hi all  I'm using Thingworx 7.4 currently and I'm trying to Parse an Xml file below is my code

var params = { 

proxyScheme: undefined /* STRING */, 

headers: undefined /* JSON */, 

ignoreSSLErrors: undefined /* BOOLEAN */, 

useNTLM: undefined /* BOOLEAN */, 

workstation: undefined /* STRING */, 

useProxy: undefined /* BOOLEAN */, 

withCookies: undefined /* BOOLEAN */, 

proxyHost: undefined /* STRING */, 

url: "http://www.holidaywebservice.com/HolidayService_v2/HolidayService2.asmx/GetCountriesAvailable" /* STRING */, 

timeout: undefined /* NUMBER */, 

proxyPort: undefined /* INTEGER */, 

password: undefined /* STRING */, 

domain: undefined /* STRING */, 

username: undefined /* STRING */ 

}; 

// result: XML 

var result = Resources["ContentLoaderFunctions"].GetXML(params);

I'm getting this error.

Please help me fix it