Error: Sys.WebForms.PageRequestManagerServerErrorException in asp.net

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I have an AJAX TabContainer in update panel which have menus. when I try to switch those menus it never switch the menu stays on same page. Following error caught by javascript. enter image description here

How to find exact error line number. It wont allow me to debug too..!

Please help! Help appreciated!

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Moe On

Use IE developer tools (Open IE and hit F12).

Make sure to select the Debugger tab in the developer tools window.

IE Developer Tools