The aspx page was working fine and after I added a asp:UpdatePanel, I started getting this message. I have added the required ajax register tags. Any pointers regarding the error would be helpful.
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By `added the required ajax register tags` you mean you added ScriptManager? – Yuriy Galanter Nov 27 '13 at 17:39
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@YuriyGalanter yes. added scriptmanager – sansid Nov 27 '13 at 17:41
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http://stackoverflow.com/questions/8105648/system-web-ui-scriptmanager-is-defined-in-an-assembly-that-is-not-referenced-b please refer this link – rach Nov 27 '13 at 17:43