ASP.NET ‘Sys.Extended.UI’ is null or not an object error using AjaxControlToolkit

To resolve this issue simply add CombineScripts=”false” to the AjaxToolkitManager tag,

<asp:ToolkitScriptManager ID=”ToolkitScriptManager1″ runat=”server” CombineScripts=”false” ></asp:ToolkitScriptManager>

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13 thoughts on “ASP.NET ‘Sys.Extended.UI’ is null or not an object error using AjaxControlToolkit

  1. After spending my entire Saterday reading 100’s of articles trying to fix this issue I was sure this easy fix wasnt going to work, but it did!!! Thanks a mil!!!!!

  2. Hi, I know this is old, but I believe it’s
    Thanks for the help, though. Can be a little difficult when it’s in one .ascx, and you can’t find the containing page’s ‘ScriptManager’ tag. (You can only have one or the other.)

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