[InvalidCastException: [A]System.Web.Configuration.ScriptingAuthenticationServiceSection cannot be cast to [B]System.Web.Configuration.ScriptingAuthenticationServiceSection. Type A originates from 'System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Web.Extensions\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Extensions.dll'. Type B originates from 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll'.]
System.Web.ApplicationServices.ApplicationServiceHelper.EnsureAuthenticationConfigLoaded() +91
System.Web.Handlers.ScriptModule.ShouldSkipAuthorization(HttpContext context) +86
System.Web.Handlers.ScriptModule.AuthenticateRequestHandler(Object sender, EventArgs e) +61
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +139
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +88
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