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

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

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

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

    luisrgg said:
    August 3, 2010 at 10:59 pm

    thnks a lot !!!, very helpfull…

    adriaanvanheerden said:
    August 14, 2010 at 6:29 pm

    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!!!!!

    natrajme said:
    August 26, 2010 at 10:22 am

    Thanks a lot for this fix. I spend whole day searching for this kind of fix

    jsk4125 said:
    December 10, 2011 at 1:30 am

    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.)

      jsk4125 said:
      December 10, 2011 at 1:36 am

      I’m an idiot. The ToolkitScriptmanager tag was right in the file that was blowing up. Sorry.

    Khalil - Shreateh said:
    May 18, 2012 at 7:35 am

    spending all my reading articles , and that was just it ? guys should publish it every where .

    Non Sense said:
    July 11, 2012 at 3:41 pm


    Erling O. Vignisson (@erlingormar) said:
    August 27, 2012 at 7:01 pm

    Chiming in to say thanks – and hopefully get you up in Google’s search results by an inch or two ;)

    Praveen Kumar Gandla said:
    December 21, 2012 at 12:05 pm

    Great buddy…. your solution awesome ….. thanks lot

    sabiha khan said:
    November 26, 2013 at 3:32 pm

    I am also facing same issue but i am using ScriptManager,
    please let me where should i have to add the CombineScripts property

    Manikandan R said:
    March 20, 2014 at 11:10 am

    Thanks a lot.. You saved my day :)

    Sarath potlacheruvu said:
    July 30, 2014 at 6:08 pm

    @sabiha khan you need to use ToolkitScriptManager not ScriptManager in your design page.Then right click for properties you will find CombineScripts property.

    Chidananda n c said:
    February 27, 2015 at 12:41 pm

    CombineScripts=”false” This one solve my problem,,Thanks a lot..

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