Get 'is null' error when using JQuery Adapter

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js"></script> 
<script type="text/javascript" src="/secure/ckeditor/ckeditor.js"></script>
<script type="text/javascript" src="/secure/ckeditor/adapters/jquery.js"></script>

   <script type="text/javascript">
   //<![CDATA[

$(function()
{
   var config = {
      toolbar:
      [
         ['Bold', 'Italic', '-', 'NumberedList', 'BulletedList', '-', 'Link', 'Unlink'],
         ['UIColor']
      ]
   };

   // Initialize the editor.
   // Callback function can be passed and executed after full instance creation.
   $('.jquery_ckeditor').ckeditor(config);
});

   //]]>
   </script>

<textarea id="editor" class="jquery_ckeditor" name="editor"><c:out value='${html}'/></textarea>

$(".jquery_ckeditor") is null