2017-10-31 10:27:30,179 [YDAWBH120][Thread:22][ERROR] DotNetNuke.Services.Exceptions.Exceptions - FriendlyMessage="Fout: Site Settings is op dit moment niet beschikbaar." ctrl="ASP.desktopmodules_admin_portals_sitesettings_ascx" exc="System.Data.SqlClient.SqlException (0x80131904): Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.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 System.Data.SqlClient.SqlCommand.CompleteExecuteScalar(SqlDataReader ds, Boolean returnSqlValue)
   at System.Data.SqlClient.SqlCommand.ExecuteScalar()
   at PetaPoco.Database.ExecuteScalar[T](String sql, Object[] args)
   at DotNetNuke.Data.PetaPoco.PetaPocoHelper.ExecuteScalar[T](String connectionString, CommandType type, Int32 timeout, String sql, Object[] args)
   at DotNetNuke.Data.SqlDataProvider.ExecuteScalar[T](String procedureName, Object[] commandParameters)
   at DotNetNuke.Data.DataProvider.GetDuplicateEmailCount(Int32 portalId)
   at DotNetNuke.Entities.Users.UserController.GetDuplicateEmailCount()
   at DesktopModules.Admin.Portals.SiteSettings.UpdatePortal(Object sender, EventArgs e)
ClientConnectionId:62820d8d-300d-45a6-b905-0a948ec68c54
Error Number:512,State:1,Class:16"