title: SOAP node returns error Target-Namespace "undefined" already in use by another Schema
body: <p>I'm  trying to write a client for russian post to get track. It uses SOAP WSDL.
  I'm to get at least client object.</p>
  
  <pre><code> 'use strict'
  let soap=require('soap'),
  url = 'https://tracking.russianpost.ru/rtm34?wsdl',
  argums={}
  
  soap.createClient(url,argums,function(err, client){
      console.log(client) 
  })
  </code></pre>
  
  <p>but it returns error</p>
  
  <pre><code>Target-Namespace "undefined" already in use by another Schema!
  Target-Namespace "undefined" already in use by another Schema!
  Target-Namespace "undefined" already in use by another Schema!
  Target-Namespace "undefined" already in use by another Schema!
  Target-Namespace "undefined" already in use by another Schema!
  /home/st.cremer/Сайты/get-posts/node_modules/soap/lib/wsdl.js:481
      this.element = schema.elements[nsName.name];
                           ^
  
  TypeError: Cannot read property 'elements' of undefined
  </code></pre>
  
  <p>Can anyone explain what does it meand what should request look like?</p>