在asp.net App_Code目录中使用Nemerle

我将其添加到我的web.config system.codedom / compilers部分：

<compiler language="n;Nemerle" extension=".n" type="Nemerle.Compiler.NemerleCodeProvider,Nemerle.Compiler"/>

运行时我得到这个例外：

程序集“”已经加载到另一个应用程序域中.在machine.config中设置可以帮助解决这个问题.

堆栈跟踪

[HttpException (0x80004005): The assembly '' is already loaded in another appdomain. Setting <deployment retail="true" /> in machine.config can help solve this issue.]
   System.Web.Compilation.CodeDirectoryCompiler.GetCodeDirectoryAssembly(VirtualPath virtualDir,CodeDirectoryType dirType,String assemblyName,StringSet excludedSubdirectories,Boolean isDirectoryAllowed) +8809675
   System.Web.Compilation.BuildManager.CompileCodeDirectory(VirtualPath virtualDir,StringSet excludedSubdirectories) +128
   System.Web.Compilation.BuildManager.CompileCodeDirectories() +265
   System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +320

[HttpException (0x80004005): The assembly '' is already loaded in another appdomain. Setting <deployment retail="true" /> in machine.config can help solve this issue.]
   System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +58
   System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +512
   System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager,IApplicationHost appHost,IConfigMapPathFactory configMapPathFactory,HostingEnvironmentParameters hostingParameters) +729

[HttpException (0x80004005): The assembly '' is already loaded in another appdomain. Setting <deployment retail="true" /> in machine.config can help solve this issue.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +8890735
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +85
   System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +259

我究竟做错了什么？