基底類別包含欄位 'videoPlayer'，但它的型別 (System.Web.UI.HtmlControls.HtmlIframe) 與控制項的型別 (System.Web.UI.HtmlControls.HtmlGenericControl) 不相容。
於 System.Web.Compilation.AssemblyBuilder.AddBuildProvider(BuildProvider buildProvider)
於 System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders()
於 System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
於 System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
於 System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
於 System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
於 System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound)
於 System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp)
於 System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath)
於 System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
於 System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
於 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)