[ArgumentException: Item has already been added. Key in dictionary: 'sf:OutputCacheItemProxy' Key being added: 'sf:OutputCacheItemProxy']
System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +14583981
Telerik.Sitefinity.Web.OutputCache.SitefinityOutputCacheProvider.PersistOutputCacheItemDependencies(HttpContext context, String outputCacheKey, OutputCacheEntry outputCacheEntry, IList`1 cacheDependencies, Guid siteId, String cacheVaryKey, DateTime& utcExpiry, Boolean retry) +404
Telerik.Sitefinity.Web.OutputCache.SitefinityOutputCacheProvider.TryHandleCacheDependencies(String outputCacheKey, Object entry, DateTime& utcExpiry) +1056
Telerik.Sitefinity.Web.OutputCache.SitefinityOutputCacheProvider.AddAsync(String key, Object entry, DateTime utcExpiry) +100
Telerik.Sitefinity.Web.OutputCache.<InsertResponseAsync>d__37.MoveNext() +563
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Telerik.Sitefinity.Web.OutputCache.<InsertResponseAsync>d__36.MoveNext() +398
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Telerik.Sitefinity.Web.OutputCache.<CacheResponseAsync>d__11.MoveNext() +333
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Telerik.Sitefinity.Web.OutputCache.<OnLeaveAsync>d__11.MoveNext() +283
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +32
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Telerik.Sitefinity.Web.OutputCache.TaskAsyncHelper.EndTask(IAsyncResult ar) +60
System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +477
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +220
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +134
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