“/”应用程序中的服务器错误。

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[HttpException (0x80004005): 文件“/404.aspx”不存在。]
   System.Web.UI.Util.CheckVirtualFileExists(VirtualPath virtualPath) +10199087
   System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) +468
   System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) +103
   System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound) +165
   System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp) +43
   System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) +31
   System.Web.UI.PageHandlerFactory.System.Web.IHttpHandlerFactory2.GetHandler(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) +64
   System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) +191
   System.Web.HttpServerUtility.Execute(String path, TextWriter writer, Boolean preserveForm) +518

[HttpException (0x80004005): 为 ~/404.aspx 执行子请求时出错。]
   System.Web.HttpServerUtility.Execute(String path, TextWriter writer, Boolean preserveForm) +787
   System.Web.HttpServerUtility.Transfer(String path, Boolean preserveForm) +57
   System.Web.HttpServerUtility.Transfer(String path) +32
   VTWLF.Controller.BasePage.NotFound() in D:\VTWeb\VTWeb-20170208\Controller\BasePage.cs:54
   product.Page_Load(Object sender, EventArgs e1) +3445
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678