SQL Server 2005 Reporting Services: The type 'System.Web.UI.ScriptManager' is ambiguous.
The type 'System.Web.UI.ScriptManager' is ambiguous If you are trying to run SSRS2005 (or any version really) and you get the following error... The type 'System.Web.UI.ScriptManager' is ambiguous: it could come from assembly 'C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\1.0.61025.0__31bf3856ad364e35\System.Web.Extensions.dll' or from assembly 'C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll'. Please specify the assembly explicitly in the type name. It could be because your web.config file is referring to at least two versions of the same DLL and one of them need to be removed. Most suggested solutions suggest to delete everything in your /bin folder and rebuild your application. That is not necessary and could cause more problems than it's worth. Besides you could have other applications that actually require the older version of the DLL, which was the case with me. Your a