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System.Exception: Exception while creating a value. ---> System.Data.SqlClient.SqlException: New transaction is not allowed because there are other threads running in the session.
   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.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.TdsParser.TdsExecuteTransactionManagerRequest(Byte[] buffer, TransactionManagerRequestType request, String transactionName, TransactionManagerIsolationLevel isoLevel, Int32 timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj, Boolean isDelegateControlRequest)
   at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransactionYukon(TransactionRequest transactionRequest, String transactionName, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
   at System.Data.SqlClient.SqlInternalConnection.BeginSqlTransaction(IsolationLevel iso, String transactionName, Boolean shouldReconnect)
   at System.Data.SqlClient.SqlConnection.BeginTransaction(IsolationLevel iso, String transactionName)
   at System.Data.SqlClient.SqlConnection.BeginDbTransaction(IsolationLevel isolationLevel)
   at StackExchange.Profiling.Data.ProfiledDbConnection.BeginDbTransaction(IsolationLevel isolationLevel) in c:\Code\github\SamSaffron\MiniProfiler\StackExchange.Profiling\Data\ProfiledDbConnection.cs:line 206
   at Umbraco.Core.Persistence.Database.BeginTransaction(IsolationLevel isolationLevel)
   at Umbraco.Core.Scoping.Scope.get_Database()
   at Umbraco.Core.Persistence.Repositories.MacroRepository.<PerformGetByQuery>d__9.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
   at Umbraco.Core.Services.MacroService.GetByAlias(String alias)
   at umbraco.cms.businesslogic.macro.Macro.<>c__DisplayClass55_0.<GetByAlias>b__0()
   at Umbraco.Core.Cache.CacheProviderExtensions.<>c__DisplayClass0_0`1.<GetCacheItem>b__0()
   at Umbraco.Core.Cache.DictionaryCacheProviderBase.<>c__DisplayClass10_0.<GetSafeLazy>b__0()
   --- End of inner exception stack trace ---
   at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItemInternal(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, Func`1 dependency)
   at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, String[] dependentFiles)
   at Umbraco.Core.Cache.DeepCloneRuntimeCacheProvider.GetCacheItem(String cacheKey, Func`1 getCacheItem, Nullable`1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, String[] dependentFiles)
   at umbraco.cms.businesslogic.macro.Macro.GetByAlias(String alias)
   at umbraco.macro..ctor(String alias)
   at Umbraco.Web.UmbracoComponentRenderer.RenderMacro(String alias, IDictionary`2 parameters, page umbracoPage)
   at ASP._Page_Views_Partials_Grid_Editors_Macro_cshtml.Execute()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer)
   at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)
   at ASP._Page_Views_Partials_Grid_Editors_Base_cshtml.Execute()

New transaction is not allowed because there are other threads running in the session.