while using drag and drop operation in jquery ui giving error

We are using

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.js"></script>
<script src="js/mousewheel.js" type="text/javascript"></script>
<script src="js/scrollpane.js" type="text/javascript"></script>
<script src="js/fancybox.js" type="text/javascript"></script>
<script src="js/tabs/js/tabs.js" type="text/javascript"></script>
<script src="js/jquery.tipsy.js" type="text/javascript"></script>

and when i try to use drag and drop

$("#move").draggable();
$("#pp-you").droppable({
  drop: function() { alert('dropped'); }
});

and when i try to drag it gives this error

 $.widget.prototype._trigger is undefined
return $.widget.prototype._trigger.call(this, type, event, ui); 

You should try and check your HTML/Javascript with Firebug.

$("#move").draggable();

$("#pp-you").droppable({
  drop: function() {
    alert('dropped');
  }
});

#move {
  width: 100px;
  height: 100px;
  background-color: red;
}
#pp-you {
  width: 100px;
  height: 100px;
  background-color: green;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.js"></script>

<div id="move">try to move me</div>
<div id="pp-you">drop stuff here</div>

I've created a fiddle and it seems to work fine.