Jquery function not getting called
===

I am trying to call the Jquery function its not working.

    jQuery(document).ready(function(){
      jQuery("#aspnetForm").validationEngine();
    });

error is gettng at the line :

   

>  jQuery("#aspnetForm").validationEngine(); Error : 'undefined' is null
> or not an object



When i take the watch one the code 

    jQuery("#aspnetForm")

It is showing the dom

But not on 

    jQuery("#aspnetForm").validationEngine();

But the above javascript functionity works in my local system. But when i integrate this code in sharepoint its not working
 
Looks like a scope issue.