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An error occurred while attaching module (Dynamicweb.Frontend.Content)

System.Data.SqlClient.SqlException (0x80131904): Transaction (Process ID 121) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean& moreRows)
   at System.Data.SqlClient.SqlDataReader.TryReadInternal(Boolean setTimeout, Boolean& more)
   at System.Data.SqlClient.SqlDataReader.Read()
   at Dynamicweb.Forum.Message.GetMessagesBySql(String sqlCommandText, Boolean isThread)
   at Dynamicweb.Forum.Message.GetThreadsByCategories(CategoryCollection categories, ThreadsOrderByFields orderBy, Int32 start, Int32 take)
   at Dynamicweb.Forum.Renderer.InitializeThreadsPager(Category category, Template template, Boolean onlyUnanswered, Boolean onlyUnsolved)
   at Dynamicweb.Forum.Renderer.RenderThreads(Template template, Category category, Boolean onlyUnanswered, Boolean onlyUnsolved)
   at Dynamicweb.Forum.Frontend.ListThreads(Category category, Boolean onlyUnsolved, Boolean onlyUnanswered)
   at Dynamicweb.Forum.Frontend.GetContent()
   at Dynamicweb.Frontend.Content.GetModuleOutput(Paragraph paragraph, PageView pageview)
ClientConnectionId:01540c38-aace-4c5c-9371-6cc80a052c4a
Error Number:1205,State:51,Class:13