How to error in manage
<p>i have designed web application in asp.net...i have publish a website..
 i have create virtual directory and copy the publish file....
 and browse the website...</p>

<p>The error r occure</p>

<blockquote>
  <p>Object reference not set to an instance of an object. 
  Description: An unhandled exception occurred during the execution of the current web
  request. Please review the stack trace for more information about the error and where it 
  originated in the code. </p>
  
  <p>Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.</p>
  
  <p>Source Error: 
   An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.</p>
</blockquote>

<p><img src="http://i.stack.imgur.com/bSy3g.png" alt="enter image description here"></p>
