[ConfigurationErrorsException: '4.0' is not a valid value for attribute 'system.codedom/compilers/compiler/ProviderOption/CompilerVersion'.]
System.Web.Compilation.MultiTargetingUtil.ReportInvalidCompilerVersion(String compilerVersion) +120
System.Web.Compilation.MultiTargetingUtil.ValidateCompilerVersionFor40AndAbove(String compilerVersion) +9764816
System.Web.Compilation.MultiTargetingUtil.ValidateCompilerVersionFor40AndAbove() +145
System.Web.Compilation.MultiTargetingUtil.InitializeTargetFrameworkName() +107
System.Web.Compilation.MultiTargetingUtil.EnsureFrameworkNamesInitialized() +153
System.Web.Compilation.BuildManager.Initialize() +213
System.Web.Compilation.BuildManager.InitializeBuildManager() +238
System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException) +498
[HttpException (0x80004005): '4.0' is not a valid value for attribute 'system.codedom/compilers/compiler/ProviderOption/CompilerVersion'.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +10089676
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +99
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +263
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