the above mentioned error i have found when i published my website in webserver i developed my site in .net 4.0 and used ajax 4.0 version.
can anybody tell me the exact problem and what will be the solution.???
I got solution for this problem ..
I left following Code in Webconfig file.
coz i dont know about it .. now problem is solved.
<add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit"/>
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