Emulator error

So im using emulator on my r63b hotel im trying to make the client will connect to my emulator but not fully because my emulator give of this error code criticul error logged i looked in the log file and see this

Bug duing user login: System.InvalidCastException: Specified cast is not valid.
at Silverwave.HabboHotel.Users.Authenticator.HabboFactory.GenerateHabbo(DataRow dRow, DataRow mRow, List`1 group) in c:\Users\Root\Desktop\Silverwave Emulator\HabboHotel\Users\Authenticator\Authenticator.cs:line 20
at Silverwave.HabboHotel.Users.UserDataManagement.UserDataFactory.GetUserData(String sessionTicket, String ip, Byte& errorCode) in c:\Users\Root\Desktop\Silverwave Emulator\HabboHotel\Users\UserData\UserDataFactory.cs:line 440
at Silverwave.HabboHotel.GameClients.GameClient.tryLogin(String AuthTicket) in c:\Users\Root\Desktop\Silverwave Emulator\HabboHotel\GameClients\GameClient.cs:line 134



Can anyone help me by telling me how this can be fixed ?