Cannot parse response error while consuming SOAP service with node.js

I am trying to consume a SOAP web service using node-soap module. However, I get 'Cannot parse response' error while calling one of the method of the web service.

Here is the implementation:

var soap = require('soap');
var url = 'http://myservice.com/MyService.svc?wsdl';
var args = {
    Username: '***',
    Password: '***'
};

soap.createClient(url, function(err, client) {
    if (!err) {      
        client.MyService(args, function(err, response) {
            if (!err) {
                console.log('MyService response:', response);
            } else {
                console.log('Error in MyService:', err);
            }
        });
    } else {
        console.log('Error in createClient: ', err);
    }
});

How can I fix this?

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