Troubleshooting the error "Missing instance data for this datepicker"

Troubleshooting the error "Missing instance data for this datepicker"

Hi,
I'd like to create a form using the plugin jquery-dynamic-form and jQuery UI Datepicker but am obviously doing something wrong. Here's what I have ...
  1. <link href="/includes/styles/smoothness/jquery-ui-1.8.4.custom.css" rel="stylesheet" type="text/css" media="screen" />
  2. <script type="text/javascript" src="http://jquery-ui.googlecode.com/svn/trunk/jquery-1.4.2.js" ></script>
  3.     <script type="text/javascript" src="http://jquery-ui.googlecode.com/svn/trunk/ui/jquery.ui.core.js" ></script>
  4.     <script type="text/javascript" src="http://jquery-ui.googlecode.com/svn/trunk/ui/jquery.ui.datepicker.js" ></script>
  5. <script type="text/javascript" src="/includes/javascript/jquery-dynamic-form.js"></script>
  6. <script type="text/javascript">
  7.     $(document).ready(function() {
  8.     $('.datepicker').datepicker();
  9.         $('#availabilityRanges').dynamicForm("#plus",  "#minus", {limit: 50,
  10.             afterClone: function(clone) {
  11.                 $('.datepicker').removeClass('hasDatepicker').datepicker();
  12.             }
  13.         });
  14.     });
  15. </script>
  16.   <div id="main" class="container">
  17.     <div id="main-inner">
  18.       <div id="center">
  19.         <div id="centerCat">
  20.           <form name="ResponderData" action="someForm">
  21.               <fieldset id="availabilityRanges">
  22.                 <p>
  23.                     <label for="startDate0">Start</label>
  24.                     <input id="startDate0" name="startDate0" class="datepicker" size="10" type="text" />
  25.                     <label for="endDate0">End</label>
  26.                     <input id="endDate0" name="endDate0" class="datepicker" size="10" type="text" />&nbsp;&nbsp;<a id="minus" href="javascript:;">[-]</a>&nbsp;&nbsp;<a id="plus" href="javascript:;">[+]</a>
  27.                 </p>
  28.             </fieldset>
  29.               <input type="submit" name="Save" Value="Save">
  30.           </form>
  31.         </div>
  32.       </div>
  33.     </div>
  34.   </div>
When I click on a date I get the error "Missing instance data for this datepicker".
Could someone please tell me what I'm doing wrong?

Many thanks!