ПОМОГИТЕ МНЕ!! Исключение типа "System.IO.IOException" произошло в mscorlib.dll но не был обработан в пользовательском коде

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Привет,я новичок в этой технологии, пожалуйста, помогите me.in мой проект mvc,я разрабатываю проекты веб-API, когда я запускаю программу, я получаю эту ошибку

An exception of type 'System.IO.IOException' occurred in mscorlib.dll but was not handled in user code

Additional information: The device is not ready.

здесь приходит ошибка

public SafeDirectoryCatalog(string directory)
      {
          var files = Directory.EnumerateFiles(directory, "*.dll", SearchOption.AllDirectories);//ERROR HERE

          this.catalog = new AggregateCatalog();

          foreach (var file in files)
          {
              try
              {
                  var asmCat = new AssemblyCatalog(file);

                  ////Force MEF to load the plugin and figure out if there are any exports
                  // good assemblies will not throw the RTLE exception and can be added to the catalog
                  if (asmCat.Parts.ToList().Count > 0)
                  {
                      this.catalog.Catalogs.Add(asmCat);
                  }
              }

Source Error: 


Line 32:         public SafeDirectoryCatalog(string directory)
Line 33:         {
Line 34:             var files = Directory.EnumerateFiles(directory, "*.dll", SearchOption.AllDirectories);
Line 35: 
Line 36:             this.catalog = new AggregateCatalog();

Source File: C:\ProjectVI\Code\BA\ProjectVI.Api\Install\SafeDirectoryCatalog.cs    Line: 34 

Stack Trace: 


[IOException: The device is not ready.
]
   System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +11185413
   System.IO.FileSystemEnumerableIterator`1.CommonInit() +241
   System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler, Boolean checkHost) +445
   System.IO.Directory.EnumerateFiles(String path, String searchPattern, SearchOption searchOption) +96
   ProjectVI.Api.Install.SafeDirectoryCatalog..ctor(String directory) in C:\ProjectVI\Code\BA\ProjectVI.Api\Install\SafeDirectoryCatalog.cs:34
   ProjectVI.Api.Install.MefConfig.Register() in C:\ProjectVI\Code\BA\ProjectVI.Api\Install\MefConfig.cs:28
   ProjectVI.Api.WebApiApplication.Application_Start() in C:\ProjectVI\Code\BA\ProjectVI.Api\Global.asax.cs:30

[HttpException (0x80004005): The device is not ready.
]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +9916673
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +118
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +172
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +336
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +296

[HttpException (0x80004005): The device is not ready.
]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9930568
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +101
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254

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