Hi,

I've got rid of the error and the page now works. My web.config file >>>>

<?xml version="1.0"?>
<configuration>
    <appSettings>
        <!-- You can set a low upload speed to test the progress bar. -->
        <!--
  <add key="CuteWebUI.AjaxUploader.UploadSpeedKB" value="20" />
  -->
    </appSettings>
    <system.web>
        <httpRuntime maxRequestLength="2000000"/>
        <pages>
            <controls>
                <add namespace="CuteWebUI" assembly="CuteWebUI.AjaxUploader" tagPrefix="CuteWebUI"/>
                <add namespace="MagicAjax.UI.Controls" assembly="MagicAjax" tagPrefix="MagicAjax"/>
            </controls>
            <namespaces>
                <add namespace="System.Collections.Generic"/>
                <add namespace="System.IO"/>
                <add namespace="System.Data"/>
                <add namespace="System.Data.SqlClient"/>
            </namespaces>
        </pages>
        <compilation debug="true">
            <assemblies>
                <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            </assemblies>
        </compilation>
        <httpHandlers>
            <remove verb="*" path="*.asmx"/>
            <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
            <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
            <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
        </httpHandlers>
        <httpModules>
            <add name="MagicAjax" type="MagicAjax.MagicAjaxModule, MagicAjax" />
            <!-- UploadModule is optional , for the property Uploader.ShowProgress -->
            <add name="CuteWebUI.UploadModule" type="CuteWebUI.UploadModule,CuteWebUI.AjaxUploader"/>
        </httpModules>
    </system.web>
    <system.webServer>
        <modules>
            <remove name="MagicAjax"/>
            <add name="MagicAjax" type="MagicAjax.MagicAjaxModule, MagicAjax" />
            <remove name="CuteWebUI.UploadModule"/>
            <add name="CuteWebUI.UploadModule" type="CuteWebUI.UploadModule,CuteWebUI.AjaxUploader"/>
        </modules>
    </system.webServer>
</configuration>


Notice the extra lines in <system.webServer> that are not included in the original files when you download the examples from this site

    <system.webServer>
        <modules>
            <remove name="MagicAjax"/>
            <add name="MagicAjax" type="MagicAjax.MagicAjaxModule, MagicAjax" />
            <remove name="CuteWebUI.UploadModule"/>
            <add name="CuteWebUI.UploadModule" type="CuteWebUI.UploadModule,CuteWebUI.AjaxUploader"/>
        </modules>
    </system.webServer>