this is my web.config:

<?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" />
  -->
  <!--add from luca-->
  <add key="CuteWebUI.AjaxUploader.TempDirectory" value="~/public/UploaderTemp"/>
  <add key="CuteWebUI.AjaxUploader.MultipleFilesUpload" value="true"/>
 </appSettings>
 <system.web>
 <!--<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>-->
 <customErrors mode="Off"/>
    <httpRuntime maxRequestLength="2000000"/>
    <pages>
   <controls>
    <add namespace="CuteWebUI" assembly="CuteWebUI.AjaxUploader" tagPrefix="CuteWebUI"/>
    <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
   </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.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <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="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    <!-- UploadModule is optional , for the property Uploader.ShowProgress -->
      <add name="CuteWebUI.UploadModule" type="CuteWebUI.UploadModule,CuteWebUI.AjaxUploader"/>
  </httpModules>
 </system.web>
</configuration>

THANKS TO ALL :)