ASP.NET Ajax client-side framework failed to load RRS feed

  • Question

  • User31884517 posted
    I have just installed Microsoft Visual Web Developer 2010 Express on a new computer with Windows 7 Professional.

    I have opgraded a webproject from Microsoft Visual Web Designer 2008 Express to Microsoft Visual Web Designer 2010 Express.

    I get error message: "ASP.NET Ajax client-side framework failed to load", when I run following simple page:


    <%@ Page Language="VB" AutoEventWireup="false" CodeFile="test3.aspx.vb" Inherits="test3" %>

    <!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">
    <form id="form1" runat="server">

    <a href="test.zip" >Download test file</a>



    In my web.config file is written:

    The system.webServer section is required for running ASP.NET AJAX under Internet Information Services 7.0. It is not necessary for previous version of IIS.

    My system.webServer section is empty and  Internet Information Services 7.0 is installed on my computer.

    Has this anything to do with the error message ? How can I solve the problem?
    I have googled a lot on "ASP.NET Ajax client-side framework failed to load", but I have not found any useful advices to solve my problem.
    If I create a new project in VWD 2010 and insert:

    <a href="test.zip" >Download test file</a>

    in a new webpage, I get the same error message, when I view it in the browser.

    Best regards,


    Tuesday, August 31, 2010 2:42 AM


  • User-801004448 posted

    Some old topics about same error



    • Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM
    Thursday, September 2, 2010 11:42 PM