Nodejs, soap, callback is not a function - node.js

Question

first i got pfx certficate which a exported it to pem and key with openssl (if this could be an issue). I trid to use client.setSecurity(new soap.ClientSSLSecurit ()) but then i get client undefined.
my code goes like this:
var soap = require('soap'),
fs = require('fs');
var url = 'tes.com';
var auth = "Basic " + new Buffer("user" + ":" + "password").toString("base64")
soap.createClient( url, {wsdl_options: {
cert: fs.readFileSync('cert/certificate.pem'),
key: fs.readFileSync('cert/certificate.key')
}
}, { wsdl_headers: {Authorization: auth} }, function(err, client) {
client.describe();
});
I am getting this error and do not know what is wrong:
callback(err, wsdl && new Client(wsdl, endpoint, options));
^
TypeError: callback is not a function
at D:\web\mobile\node_modules\soap\lib\soap.js:50:5
at D:\web\mobile\node_modules\soap\lib\soap.js:33:16
at D:\web\mobile\node_modules\soap\lib\wsdl.js:2167:9
at Request._callback (D:\web\mobile\node_modules\soap\lib\http.js:114:14)
at self.callback (D:\web\mobile\node_modules\request\request.js:187:22)
at emitOne (events.js:96:13)
at Request.emit (events.js:188:7)
at Request.onRequestError (D:\web\mobile\node_modules\request\request.js:813:8)
at emitOne (events.js:96:13)
at ClientRequest.emit (events.js:188:7)
tnx
miha

Answer 1

Your arguments is not correct. Please correct like this :
soap.createClient( url, {wsdl_options: {
cert: fs.readFileSync('cert/certificate.pem'),
key: fs.readFileSync('cert/certificate.key')
},
wsdl_headers: {Authorization: auth} }, function(err, client) {
client.describe();
});