I just setup VS Orcas beta 2 (on vista an win server 2003) and created an AJAXFutures web site. However site failed to compile on either OS. At first the scriptmanager control could not be rendered properly, but after replacing with the same control from the toolbox, this problem disappeared. However the following   errors appeared:

.Error 1 Could not load file or assembly 'System.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified. D:\Documents and Settings\Administrator.ACERLAPTOP\My Documents\Visual Studio 2008\WebSites\AJAXFuturesEnabledWebSite2\Web.config 67 

Error 2 D:\Documents and Settings\Administrator.ACERLAPTOP\My Documents\Visual Studio 2008\WebSites\AJAXFuturesEnabledWebSite2\Default.aspx: ASP.NET runtime error: Could not load file or assembly 'System.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified. (D:\Documents and Settings\Administrator.ACERLAPTOP\My Documents\Visual Studio 2008\WebSites\AJAXFuturesEnabledWebSite2\web.config line 60) D:\Documents and Settings\Administrator.ACERLAPTOP\My Documents\Visual Studio 2008\WebSites\AJAXFuturesEnabledWebSite2\Default.aspx 1 1 D:\...\AJAXFuturesEnabledWebSite2\

For errors 1 & 2, I checked the GAC and found only version 3.5.0.0 for the System (No version 2.0.0.0 exists).Core so I was wondering if I need to add this manually to the GAC and if so where to check for the dll to register? Or is there another solution? Thanks for any suggestion.

Be sure to run the batch file mentioned at the bottom of this blog:

http://weblogs.asp.net/scottgu/archive/2007/07/26/vs-2008-and-net-3-5-beta-2-released.aspx

I am experiencing the same problem with VS 2008 Beta2 on Vista. I did run the DisableAjaxPolicy.cmd script but that did not help. VS still cannot load System.Core v 2.0...

I was wondering if you have a resolution?

Have you tried using the 3.5.0.0 version of system.core in your web.config? I think this should take care of the problem. The version number was updated a couple of months ago and the web.config template should be fixed to use the updated version. I will check with the futures team to make sure this is the case.

Thanks,

Joe

This is the compliation element in the web.config

<assemblies>

<add assembly="System.Web.Extensions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

</assemblies>

<add extension="*.asbx" type="Microsoft.Web.Preview.Services.BridgeBuildProvider"/>

</compilation>

I made the change for system.core to 3.5.0.0 and received the following errors:

 Error 4 Could not load file or assembly 'System.Web.Extensions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.  
Error 5 Could not load file or assembly 'System.Web.Extensions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.  
Error 6 Element 'ScriptManager' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing. D:\Documents and Settings\Administrator.ACERLAPTOP\My Documents\Visual Studio 2008\WebSites\AJAXFuturesEnabledWebSite1\Default.aspx 10 14 D:\...\AJAXFuturesEnabledWebSite1\

I checked my assembly cache from the .NET 2.0 Configuration tool, but could not find:

System.Web.Extensions, Version=2.0.0.0

so I don't believe it is registered. If needed, which dll do I have to register to include this in the GAC.
 

I also noticed that if I juat use a normal asp.net web template to create a website in Orcas, I can compile and run an application using the updatepanel with a scriptmanager. However, I do not get code completion in Ajax client scripting (eg if I type "Sys." , I do not get any code completion, and when debugged, I get errors like Sys.UI.Window is null. Am I missing a reference, I thought VS Orcas sites had all the required references for ajax codecompletion/hinting. Please let me know if they have an updated Ajax Web site template to fix these problems or any solution to fix the above problems

System.web.extensions should be using version 3.5.0.0 as well. If you look at the web.config when you create a normal website you should see this version in the web.config, which is why you are able to compile.