How can I resolve the below issue that I get when I am running my precompiled web app?
Server Error in '/CRM' Application.
The directory '/CRM/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 '/CRM/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 '/CRM/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) +8777420
System.Web.Compilation.BuildManager.CompileCodeDirectory(VirtualPath virtualDir, CodeDirectoryType dirType, String assemblyName, StringSet excludedSubdirectories) +125
System.Web.Compilation.BuildManager.CompileCodeDirectories() +387
System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +248
[HttpException (0x80004005): The directory '/CRM/App_Code/' is not allowed because the application is precompiled.]
System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +62
System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +421
System.Web.Compilation.BuildManager.CallAppInitializeMethod() +31
System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +605
[HttpException (0x80004005): The directory '/CRM/App_Code/' is not allowed because the application is precompiled.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +8946484
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +97
System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +258
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1
Depending on your case, there are three possible scenarios:
see this link http://www.beansoftware.com/ASP.NET-FAQ/Directory-App_Code-Not-Allowed.aspx
Basically, If you precompiled your app, there shoudn't be an App_Code folder. If you added it later, you should delete it.
OR
May be Somehow a precompiled.config file has made it to production. Deleting that file should resolve the App_Code directory error.
Deleting the "precompiledApp.config" file should solve your problem.
In my case, I mistakenly, forced Publish a class, which caused this issue.
The Solution was to make an update on the offending class, then Publish again with the option "Delete unused files from the Destination Site". (Which is under the publish modal options)
In my case I compiled with "ASPX files are updateable" option checked OFF. I guess the IIS my website was running on did not like that.
Once I recompiled with "ASPX files are updateable" option checked ON, the issue disappeared.
来源：https://stackoverflow.com/questions/24484888/the-directory-website-app-code-is-not-allowed-because-the-application-is-pre