SquishIt - System.ArgumentException: Item has already been added

[StingB]

Every now and then my application throws the exception below and user won't be able to login. Can any please assist on how to resolve this? Thanks in advance.

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.ArgumentException: Item has already been added. Key in dictionary: '0'  Key being added: '0'

   at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)

   at System.Collections.Hashtable.Add(Object key, Object value)

   at Yahoo.Yui.Compressor.JavaScriptCompressor.BuildSymbolTree()

   at Yahoo.Yui.Compressor.JavaScriptCompressor.DoCompress(String source)

   at Yahoo.Yui.Compressor.Compressor.Compress(String source)

   at SquishIt.Framework.Minifiers.JavaScript.YuiMinifier.Minify(String content)

   at SquishIt.Framework.Base.BundleBase`1.MinifyIfNeeded(String content, Boolean minify)

   at SquishIt.Framework.JavaScript.JavaScriptBundle.ProcessFile(String file, String outputFile, Asset originalAsset)

   at SquishIt.Framework.JavaScript.JavaScriptBundle.<>c__DisplayClass4.<>c__DisplayClass6.<AggregateContent>b__1(String f)

   at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()

   at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext()

   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)

   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)

   at SquishIt.Framework.JavaScript.JavaScriptBundle.AggregateContent(List`1 assets, StringBuilder sb, String outputFile)

   at SquishIt.Framework.Base.BundleBase`1.GetMinifiedContent(List`1 assets, String outputFile)

   at SquishIt.Framework.Base.BundleBase`1.RenderRelease(String key, String renderTo, IRenderer renderer)

   at SquishIt.Framework.Base.BundleBase`1.Render(String renderTo, String key, IRenderer renderer)

   at ASP.areas_home_views_home_index_aspx.__RenderContent2(HtmlTextWriter __w, Control parameterContainer)

   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)

   at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)

   at System.Web.UI.Control.Render(HtmlTextWriter writer)

   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)

   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)

   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)

   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)

   at System.Web.UI.HtmlControls.HtmlHead.RenderChildren(HtmlTextWriter writer)

   at System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer)

   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)

   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)

   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)

   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)

   at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)

   at System.Web.UI.Control.Render(HtmlTextWriter writer)

   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)

   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)

   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)

   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)

   at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)

   at System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer)

   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)

   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)

   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)

   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.areas_home_views_home_index_aspx.ProcessRequest(HttpContext context)

   at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.<>c__DisplayClass1.<ProcessRequest>b__0()

   at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.<>c__DisplayClass4.<Wrap>b__3()

   at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap[TResult](Func`1 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.RenderView(ViewContext viewContext, TextWriter writer, Object instance)

   at System.Web.Mvc.BuildManagerCompiledView.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__DisplayClass1c.<InvokeActionResultWithFilters>b__19()

   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)

   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1c.<>c__DisplayClass1e.<InvokeActionResultWithFilters>b__1b()

   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)

   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1c.<>c__DisplayClass1e.<InvokeActionResultWithFilters>b__1b()

   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)

   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1c.<>c__DisplayClass1e.<InvokeActionResultWithFilters>b__1b()

   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 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__DisplayClass6.<>c__DisplayClassb.<BeginProcessRequest>b__5()

   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0()

   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _)

   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()

   at System.Web.Mvc.MvcHandler.<>c__DisplayClasse.<EndProcessRequest>b__d()

   at System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f)

   at System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action)

   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.ExecuteStepImpl(IExecutionStep step)

   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

[Alex Ullrich]

What version are you running?

Have you been able to get a debugger on it?  The stack trace location makes me wonder if its actually something in one of your JS files that the minifier is choking on.  Not sure how frequently it happens but you can use .ForceRelease on the bundles to try anyway.

[Blessing Tsungu]

Hi Alex,

I'm using Squishit Framework / Yahoo.Yui.Comppressor v2.0.5727. I haven't been able to debug on it. The issue is very random and doesn't occur that often probably 4 times a yeah, but it's becoming a concern for the business.

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[Alex Ullrich]

Sorry thought I replied to this earlier.

It looks like there is a concurrency issue causing yui to choke on your content. Maybe 2 “first requests” processing in parallel or similar.

We do try to guard against this but aren’t always able - are you running in medium or low trust environment?

[Blessing Tsungu]

Hi Alex,

The application is set to run on Full trust level. It is possible that maybe 2 first requests are processing in parallel or similar like you said. I wonder how this occurs? The application runs fine most of the time and once in while this error occurs.

Thanks,

Blessing

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