title: Swfupload issue, can't use it's method addPostParam
body: <p>I've done my research here, none of them solved my problem.</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
      var swfu;
  
      window.onload = function() {
          var settings = {
              //here I ripped out my settings for convenience 
          };
  
          swfu = new SWFUpload(settings);
          swfu.addPostParam("user_id", "123456789");
       };
  &lt;/script&gt;
  </code></pre>
  
  <p>Now I got this error: Uncaught Call to SetPostParams failed</p>
  
  <p>In fact I can't call any method, because All of them gets the same error.</p>
  
  <p>What happended here?</p>