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Error: Sys.WebForms.PageRequestManagerServerErrorException: Object reference not set to an instance of an object, How to resolve it?

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I'm working in a web application that work in asp.net with Ajax but I have a problem, I'm having the message error:

Error:

Sys.Webforms.PageRequestManagerServerErrorException: Object reference not set to an instance of an object

This is Image link http://postimg.org/image/s6tpnjsjt/  Please visit and see error screen shot.

My System was stable for 20 minutes after 20 minutes i clicked on any button but page is not responding and above error raised.

How can i resolve this? Thanks in advance.


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