JQuery is not working on Win server 2008 R2

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ASP.NET

I have developed a web application. It works fine in development envirment (local PC).
But when it is deployed on the production server. JQuery datepicker & calader do not work.

I tried to debug the application and found the following errors:

Quote:

Microsoft JScript runtime error: 'jQuery' is undefined

in file:

Quote:

Scripts\jquery.datepick.js

Microsoft JScript runtime error: Object doesn't support property or method 'datepick

Quote:

$(function () {
$('#txtLetterDate').datepick({ dateFormat: 'yyyy/mm/dd' });
});

Please guide.