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ASP.Net Ajax control error in scriptresource.axd, value cannot be undefined, baseType

Posted on 2011-03-10
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Last Modified: 2012-06-21
After migrating my app from .net 2.0 to .net 3.5, I get the following error on pages containing ajax controls. I have already replaced the System.Web.Ui.ScriptManager by AjaxControlToolkit.ToolKitScriptManager. The error is raised when the page is displayed (client side).
Any idea on how to solve this issue?

Message: Sys.ArgumentUndefinedException: Value cannot be undefined.
Parameter name: baseType
Line: 1440
Char: 71
Code: 0
URI: http://localhost/ScriptResource.axd?d=saR_CPVp-PHWXQsfog4jWVmfgmrh-MEQDtqMENudeiDCJGPC0scibw88lkFlSf291zM8Xj2OnDVFqPjKhgLL07kKikTbByNEqUoYGIGOhHiGAsl4mywZg21VPkDGeQFDbcSvmQ2&t=36465846


Message: Sys.ArgumentException: Value must be null for Components that are not Controls or Behaviors.
Parameter name: element
Line: 4623
Char: 23
Code: 0
URI: http://localhost//ScriptResource.axd?d=saR_CPVp-PHWXQsfog4jWVmfgmrh-MEQDtqMENudeiDCJGPC0scibw88lkFlSf291zM8Xj2OnDVFqPjKhgLL07kKikTbByNEqUoYGIGOhHiGAsl4mywZg21VPkDGeQFDbcSvmQ2&t=36465846
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Question by:jmbio
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Kamal Khaleefa earned 500 total points
ID: 35136928
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