System.InvalidOperationException. Sequence contains more t

Posted by joyanta.sen on 05-Nov-2019 23:28

Hello All,

 I am getting the following exception while trying to edit one of the date field in the News item and publish that item.

Type : System.InvalidOperationException, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : Sequence contains more than one matching element
Source : Telerik.Sitefinity
Help link :
Data : System.Collections.ListDictionaryInternal
TargetSite : System.String MessageWorkflow(System.Guid, System.Type, System.String, System.String, Boolean, System.Collections.Generic.Dictionary`2[System.String,System.String])
HResult : -2146233079
Stack Trace : at Telerik.Sitefinity.Workflow.WorkflowManager.MessageWorkflow(Guid itemId, Type itemType, String providerName, String operationName, Boolean isCheckedOut, Dictionary`2 contextBag)
at Telerik.Sitefinity.Modules.ContentServiceBase`5.SaveContentUsingWorkflow(ContentItemContext`1 context, String parentId, String providerName, String workflowOperation)
at Telerik.Sitefinity.Modules.ContentServiceBase`5.SaveContent(ContentItemContext`1 content, String contentId, String providerName, String version, Boolean published, Boolean checkOut, String workflowOperation)
at SyncInvokeSaveContent(Object , Object[] , Object[] )
at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

Additional Info:

MachineName : 
TimeStamp : 11/1/2019 4:19:48 PM
FullName : Telerik.Sitefinity.Utilities, Version=11.1.6800.0, Culture=neutral, PublicKeyToken=b28c218413bdf563
AppDomainName : /LM/W3SVC/20/ROOT-1-132170690305083931
ThreadIdentity :
WindowsIdentity : IIS APPPOOL\
Requested URL :

Category: ErrorLog

Priority: 0

EventId: 90000

Severity: Error

Title:Enterprise Library Exception Handling


App Domain: /LM/W3SVC/20/ROOT-1-132170690305083931

ProcessId: 9388

Process Name: c:\windows\system32\inetsrv\w3wp.exe

Thread Name:

Win32 ThreadId:10948

Extended Properties:

All Replies

Posted by bazakli on 07-Jan-2020 13:17


I am facing the exact same issue at version 11.2.6929. The error only happens on the production server so it's nearly impossible to track down the cause.

Have you ever find a solution for this?


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