<StackTrace>
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer) at Dynamicweb.Ecommerce.ProductCatalog.ViewEngine.CreateView(IEnumerable`1 facetGroups, IDictionary`2 facetGroupResults, IDictionary`2 facetParameters, IEnumerable`1 queryParameters, Boolean showFacetOptionsWithNoResults) at Dynamicweb.Ecommerce.ProductCatalog.ViewModelFactory.CreateView(IEnumerable`1 facetGroups, IDictionary`2 facetGroupResults, IDictionary`2 facetParameters, IEnumerable`1 queryParameters, Boolean showFacetOptionsWithNoResults) at Dynamicweb.Ecommerce.Indexing.ProductQueryHelper.GetProductsAutoIdsFromIndexQuery(IQuery query, QuerySettings querySettings, PageView pageview, Boolean showFacetOptionsWithNoResults, IEnumerable`1& facetViewModel, IEnumerable`1& spellCheckerResult, Int32& totalProductCount) at Dynamicweb.Ecommerce.Indexing.ProductQueryHelper.GetProductsAutoIds(ProductCatalogSettings settings, ContentModule contentModule, PageView pageview, IEnumerable`1& facetViewModel, IEnumerable`1& spellCheckerResult) at Dynamicweb.Ecommerce.Feeds.XMLProvider.GetOutput(Feed feed, FeedContextConfiguration feedContextConfiguration) at Dynamicweb.Ecommerce.WebAPI.Controllers.FeedController.GetFeedOutput(Int32 id, FeedContextConfiguration feedContextConfiguration) at lambda_method(Closure , Object , Object[] ) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters) at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)--- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()--- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()--- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()
</StackTrace>