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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][1]

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="LoopinWine.WebForm2" %>

<!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.

[1]:

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>

for telerik web resources use this code:

<location path="Telerik.Web.UI.WebResource.axd">
<system.web>
<authorization>
<allow users="*"/>
</authorization>
</system.web>
</location>

Another possible cause is script combining/compression in IE 8 & 9. In web.config at the top level (within Configuration), put

<system.web.extensions>
<scripting>
<scriptResourceHandler enableCompression="false" enableCaching="true" />
</scripting>
</system.web.extensions>

On your ToolKitScriptManager put CombineScripts=False, e.g.

<asp:ToolkitScriptManager runat="server" CombineScripts="False">
</asp:ToolkitScriptManager>

see

[To see links please register here]

which is where I figured out the problem

this solution works for me:

The error on client was:

SCRIPT5022: ASP.NET Ajax client-side framework failed to load.

SCRIPT5009: 'Sys' is undefined

After many time to mining the websites, and more solutions, i solve the problem:

**the solution for .NET 4.0 is:**

Set EnableCdn property of script manager to true, Like this:

<asp:ScriptManager ID="ScriptManager1" runat="server" EnableCdn="true">

**Next Solution and Better Solution is:**

add this handler to your web.config

<system.webServer>
<handlers>
<remove name="WebServiceHandlerFactory-Integrated"/>
<remove name="ScriptHandlerFactory"/>
<remove name="ScriptHandlerFactoryAppServices"/>
<remove name="ScriptResource"/>
<add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</handlers>
</system.webServer>

In my case the Ajax loading error occurred only if I reloaded the page, not when the page was loaded for the first time.

Looking at the content in the <asp:ScriptManager> tag in Site.Master, I noticed that only some of the <asp:ScriptReference> items had Path attribute set. So, I updated MsAjaxBundle to this: <asp:ScriptReference Name="MsAjaxBundle" Path="~/Scripts/WebForms/MSAjax/MicrosoftAjax.js" /> and the problem went away. I also had to modify the WebFormsBundle the same way and now reloading the page works.

What worked for me was to download ASP.NET Ajax from [Microsoft][1].

You might also need to explicitly browse for the correct dll version when you add reference e.g.

C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5.1\System.Web.Extensions.dll

[1]:

[To see links please register here]

I set **Application Pool** as **ASP.NET 4.0 Classic** during installation.

well i just changed RadScriptManger to Simple asp:ScriptManager and it works

**Before:**

<telerik:RadScriptManager ID="RadScriptManager1" EnableCdn="true" runat="server" />

**After**

<asp:ScriptManager ID="scrReg" EnablePartialRendering="true" runat="server"></asp:ScriptManager>

Hope it helps

Add **EnableScriptCombine="False"** to your RadScriptManager as follows:

`<telerik:RadScriptManager ID="RadScriptManager1" EnableScriptCombine="False" runat="server" />`

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