sys is undefined

While developing one of the dot-net application after adding all the required stuff like update panel and controls there in when I started the program on my development machine it throws a javascript error sys is undefined, which is quite strange.

Moreover it does not appear when you build a ajax-enabled-asp.net application

The best way to solve the problem is create a dummy ajax enabled asp.net application and copy all the stuff in web.config of ajax enabled asp.net application to your normal website created in asp.net.

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