Explained Error: The directory /App_Code is not allowed... Hatası

Sayın Hocalarım ve Arkadaşlarım ben asp.net'de indirmiş olduğum bir projede bu hatayı alıyorum. araştırdım hatanın sebebini ama yabancı dilim yok anlayamadım. Bende şöyle bir hata  var:

Bunun yanıtı ise bu sayfa da http://www.beansoftware.com/ASP.NET-FAQ/Directory-App_Code-Not-Allowed.aspx bana bunun ne anlama geldiğini açıklayabilirmisiniz nasıl düzeltirim?

Server Error in '/s' Application.

The directory '/s/App_Code/' is not allowed because the application is precompiled.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Web.HttpException: The directory '/s/App_Code/' is not allowed because the application is precompiled.

Source Error: 
 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 
 

[HttpException (0x80004005): The directory '/s/App_Code/' is not allowed because the application is precompiled.]
   System.Web.Compilation.CodeDirectoryCompiler.GetCodeDirectoryAssembly(VirtualPath virtualDir, CodeDirectoryType dirType, String assemblyName, StringSet excludedSubdirectories, Boolean isDirectoryAllowed) +9750572
   System.Web.Compilation.BuildManager.CompileCodeDirectory(VirtualPath virtualDir, CodeDirectoryType dirType, String assemblyName, StringSet excludedSubdirectories) +125
   System.Web.Compilation.BuildManager.CompileCodeDirectories() +382
   System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +252

[HttpException (0x80004005): The directory '/s/App_Code/' is not allowed because the application is precompiled.]
   System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +62
   System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +427
   System.Web.Compilation.BuildManager.CallAppInitializeMethod() +31
   System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +535

[HttpException (0x80004005): The directory '/s/App_Code/' is not allowed because the application is precompiled.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9931948
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +101
   System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +456

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.36330

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