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Asked: 2026-06-06T19:50:30+00:00

I have an error Microsoft JScript runtime error: ASP.NET Ajax client-side framework failed to

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I have an error Microsoft JScript runtime error: ASP.NET Ajax client-side framework failed to load. on a blank page using masterpage

enter image description here

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">

    <div>

    </div>
    <asp:ScriptManager ID="ScriptManager1" runat="server" EnableCdn="True">
    </asp:ScriptManager>
    </form>
</body>
</html>

This is what it render it the end

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>

</title></head>
<body>
    <form method="post" action="WebForm2.aspx" id="form1">
<div class="aspNetHidden">
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJNjE2OTgwNTY5ZGTfWA/dEX85PXBlbkKsVxeLKyIn+mJQ9piW5cbeNE+qww==" />
</div>

<script type="text/javascript"> 
//<![CDATA[
var theForm = document.forms['form1'];
if (!theForm) {
    theForm = document.form1;
}
function __doPostBack(eventTarget, eventArgument) {
    if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
        theForm.__EVENTTARGET.value = eventTarget;
        theForm.__EVENTARGUMENT.value = eventArgument;
        theForm.submit();
    }
}
//]]>
</script>


<script src="http://ajax.microsoft.com/ajax/4.0/2/WebForms.js" type="text/javascript"></script>


<script src="/ScriptResource.axd?d=6x_aX-LOcgUU-O_K6nM7ST5ViC_naT1e4_j-CY35ASRLpcKYpiapwTARuePHvx3llP-Xhl_AG_ubpM1BzkM5iyn9ThB3m7lmXKvkck0cxTcYiT-VbeKgamKxp9EwxBUyIQN6sSCU9SQm3tMtmzQWRg2&amp;t=ffffffffbad362a4" type="text/javascript"></script>
<script type="text/javascript"> 
//<![CDATA[
if (typeof(Sys) === 'undefined') throw new Error('ASP.NET Ajax client-side framework failed to load.');
//]]>
</script>

<script src="/ScriptResource.axd?d=khKEuZ4oUqBYvQxJ1ISpPVIW8_AWWc907q5_v74DI2ruWKTJpldq2osxPkAZ__hffe1Q6HTQUyTbL3Q1mD6MX7V65O5ibxKwb4NvN6ycdZ8vEJ-bz51MO-8uoaP2xioK6npm5n8vldI1d0sOCnH6yw2&amp;t=ffffffffbad362a4" type="text/javascript"></script>

    <div>

    </div>
    <script type="text/javascript"> 
//<![CDATA[
Sys.WebForms.PageRequestManager._initialize('ScriptManager1', 'form1', [], [], [], 90, '');
//]]>
</script>

    </form>
</body>
</html>

The problems might be that i used to have AjaxControlToolkit in my project but later i use jquery instead. so somewhere in the project might try to add Ajaxcontroltoolkit which i can’t find it. i don’t know how to fix this error. i have tried to add bin file of ajaxcontroltoolkit back but it seems to not work.

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1 Answer

  1. Editorial Team

    Sys undefined means that you’re not getting the client side files loaded on your browser.

    Solution 1:

    <add verb="GET"
  path="ScriptResource.axd"
  type="Microsoft.Web.Handlers.ScriptResourceHandler"
  validate="false"/>

    Solution 2: If you don’t have this, add this too under <assemblies>

    <add assembly="Microsoft.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

    Solution3: If that doesn’t work too, try deleting files from your “bin” folder and rebuild the solution and clear the cache of your browser.

    Solution 4: Add this to your web.config

    <location path="ScriptResource.axd">
   <system.web>
      <authorization>
         <allow users="*"/>
      </authorization>
   </system.web>
</location>
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