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Category : Technology | Posted by : CDR | Posted on : 8/31/2008 | Updated on : 8/31/2008
Keywords : scriptreferencebase, could, system, solution, type, help, assembly, version, culture, web, extensions, load, not
Could not load type 'System.Web.UI.ScriptReferenceBase' from assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=n
I'm getting this error on my asp.net website (windows 2003 with framework 3.5), i think it's related the the ajax scriptmanager :

Error Message: Could not load type 'System.Web.UI.ScriptReferenceBase' from assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.
Source: App_Web_masterpage.master.7371103c
StackTrace: at ASP.masterpages_masterpage_master.__BuildControl__control6()
at ASP.masterpages_masterpage_master.__BuildControlsm1()
at ASP.masterpages_masterpage_master.__BuildControlform1()
at ASP.masterpages_masterpage_master.__BuildControlbody()
at ASP.masterpages_masterpage_master.__BuildControlTree(masterpages_masterpage_master __ctrl)
at ASP.masterpages_masterpage_master.FrameworkInitialize()
at System.Web.UI.UserControl.InitializeAsUserControlInternal()
at System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection)
at System.Web.UI.Page.get_Master()
at System.Web.UI.Page.ApplyMasterPage()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Answers
Update the framework 3.5 to 3.5 sp1 on your server (or recompile your website on 3.5 framework instead of 3.5sp1)
The .NET Framework 3.5 SP1 has probably not been installed.
how to update framework from 3.5 to 3.5 SP1??
Ajax toolkit is well furnished with ToolkitScriptManager jst add it to your script providingly have framework3.5 installed.
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