title: TypeError: data is undefined when using datatable plugin
body: <p>I'm trying to retrieve data from the server using DataTables.I can view the json response in the network section of my browser as well.But in the console it gives me <strong>TypeError: data is undefined</strong>. Nothing shows inside the table except column names and <strong>Processing..</strong> label.</p>
  
  <blockquote>
    <p>Here is my Json response:</p>
  </blockquote>
  
  <pre><code>{"userList":[{"age":23,"userId":123,"user_name":"Mike"},{"age":22,"userId":345,"user_name":"John"},{"age":23,"userId":123,"user_name":"Peter"}]}
  </code></pre>
  
  <p><a href="http://i.stack.imgur.com/IdGjo.png" rel="nofollow">json response img</a></p>
  
  <blockquote>
    <p>Java Script:</p>
  </blockquote>
  
  <pre><code>$(document).ready(function () {
         $('#mytable').dataTable({
                      "processing": true,
                      "serverSide": true,
                      "ajax": "jsond",
                      "columns": [
                          {"userList": "userId"},
                          {"userList": "user_name"},
                          {"userList": "age"}
                      ]
                  });
              });
  </code></pre>
  
  <blockquote>
    <p>Html:</p>
  </blockquote>
  
  <pre><code>&lt;table id="mytable"&gt;
                  &lt;thead&gt;
                      &lt;tr&gt;
                          &lt;th&gt;Id&lt;/th&gt;
                          &lt;th&gt;Name&lt;/th&gt;
                          &lt;th&gt;Age&lt;/th&gt;
  
                      &lt;/tr&gt;
                  &lt;/thead&gt;
                  &lt;tbody&gt;
                      &lt;tr&gt;
                          &lt;td&gt;&lt;/td&gt;
                          &lt;td&gt;&lt;/td&gt;
                          &lt;td&gt;&lt;/td&gt;
                      &lt;/tr&gt;
                  &lt;/tbody&gt;
                  &lt;tfoot&gt;
                      &lt;tr&gt;
                          &lt;th&gt;Id&lt;/th&gt;
                          &lt;th&gt;Name&lt;/th&gt;
                          &lt;th&gt;Age&lt;/th&gt;
                      &lt;/tr&gt;
                  &lt;/tfoot&gt;
              &lt;/table&gt;
  </code></pre>
  
  <p>Can somebody suggest me a way to get rid of this error please ....</p>