Uncaught Error: cannot call methods on page prior to initialization; attempted to call method 'bindRemove'

It happens when I try to activate a panel widget.

here is the markup (it has <?php ?> becouse it's part of a wordpress theme I'm working on)

2. <!-- /panel -->
3. <div data-role="panel" id="menu-panel">
4.     <?php  wp_nav_menu ($args); ?> 
5. </div>
6. <!-- /panel open btn -->
8.  <header data-role="header">
9.     <a href="menu-panel">open</a>
10.  </header>

the page is  http://ugauga.com/

Thanks