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An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.

Solution – In IIS, Change the app pool id to some which has Pipeline mode as ‘Classic’.    

FUSLOGW – Exception has been thrown by the target of an invocation (web.config) at ProvidersHelper.InstantiateProviders

If you see something like this in your event log , then your next step should be to check the assembly binding log. As you can see it’s a very generic error and doesn’t provide much details about the actual root cause, use this tool – http://msdn.microsoft.com/en-us/library/e74a18c4%28v=vs.71%29.aspx. Exception information:     Exception type: ConfigurationErrorsException     Exception message: […]

Unable to compile an ASP.NET 2.0 project in Visual Studio 2010 on Windows 7 x64/x32 that references System.Web.Extensions (ASP.NET AJAX 1.0).

If your project is referencing some dll which has a dependency on System.Web.Extensions.dll then it is most lilkely that you may receive this error – The primary reference “MyClass, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL” could not be resolved because it has an indirect dependency on the framework assembly “System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35” which could not be resolved […]