What is causing this error? Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerWrapper'

Question

I can't figure out why I might be getting this error. It happens on an ajax call.

Any help is appreciated. Thanks!

This is the full error text:

-- 6/21/2010 6:09:10 PM -- System.Web.HttpException (0x80004005): Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerWrapper'. ---> System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.Web.HttpException (0x80004005): OutputStream is not available when a custom TextWriter is used. at System.Web.HttpResponse.get_OutputStream() at AjaxControlToolkit.ToolkitScriptManager.OutputCombinedScriptFile(HttpContext context) in C:\AjaxBuild\Ajax\Server\AjaxControlToolkit\ToolkitScriptManager\ToolkitScriptManager.cs:line 286 at AjaxControlToolkit.ToolkitScriptManager.OnInit(EventArgs e) in C:\AjaxBuild\Ajax\Server\AjaxControlToolkit\ToolkitScriptManager\ToolkitScriptManager.cs:line 246 at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at System.Web.Mvc.ViewPage.ProcessRequest(HttpContext context) at ASP.views_listen_twittertimeline_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\8f8e9134\ff8a3ded\App_Web_4vjkjyte.13.cs:line 0 at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.<>c_DisplayClass1.b_0() at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.<>c_DisplayClass4.b_3() at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap[TResult](Func1 func) at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap(Action action) at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.ProcessRequest(HttpContext context) at System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) at System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) at System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage) at System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) at System.Web.HttpServerUtilityWrapper.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) at System.Web.Mvc.ViewPage.RenderView(ViewContext viewContext) at System.Web.Mvc.WebFormView.RenderViewPage(ViewContext context, ViewPage page) at System.Web.Mvc.WebFormView.Render(ViewContext viewContext, TextWriter writer) at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass14.<InvokeActionResultWithFilters>b__11() at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func1 continuation) at System.Web.Mvc.ControllerActionInvoker.<>c_DisplayClass14.<>c_DisplayClass16.b_13() at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList1 filters, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) at System.Web.Mvc.Controller.ExecuteCore() at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) at System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__4() at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0() at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass81.b_7(IAsyncResult _) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End() at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Answer 1

Your MVC view code probably has a syntax error in it. You probably see an error message in your error log but it won't stop the site from running since the View code isn't compiled the same way a standard class is.

So check your error log for any syntax error messages.

Answer 2

The stack trace contains the answer:

OutputStream is not available when a custom TextWriter is used. at System.Web.HttpResponse.get_OutputStream() at AjaxControlToolkit.ToolkitScriptManager.OutputCombinedScriptFile(HttpContext context) in C:\AjaxBuild\Ajax\Server\AjaxControlToolkit\ToolkitScriptManager\ToolkitScriptManager.cs:line 286 at AjaxControlToolkit.ToolkitScriptManager.OnInit(EventArgs e) in C:\AjaxBuild\Ajax\Server\AjaxControlToolkit\ToolkitScriptManager\ToolkitScriptManager.cs:line 246 at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

You're using the AjaxControlToolkit, which is a collection of server controls. Server controls are not supported by ASP.NET MVC. You may wish to call into the Javascript APIs of the AjaxControlToolkit instead of using the server controls, as this should give you the behavior you desire in an MVC-compliant manner.