from non-ajax to ajax enable configuration problem

i try to add this code on the web.config 


    <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="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"/>
    httpModules>


but it give the following error:


appropriately. 

Parser Error Message: An error occurred creating the configuration section handler for system.web.extensions/scripting/webServices/authenticationService: Could not load file or assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Source Error: 








Line 16: 					

Line 17: 					

Line 18: 					

Line 19: 					

Line 20: 				

                

                     0 
                    johncarerra
                    10/20/2008 2:27:24 AM
                

            
            

                
after try and error several things, i have try replace code at the to web.config. I have create new ajax enable website and paste the following code and comment the original code. I still not analyse what are the difference but it works!
<configSections> 

<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"> 

<section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
<sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"> 

<section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="Everywhere" />
<section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication" /> 

<section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication" />
sectionGroup> 

sectionGroup>
sectionGroup> 

configSections>

                

                     0 
                    johncarerra
                    10/20/2008 8:09:42 AM
                

            

            

 

            

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