SwiftEMU - Critical Errror

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Hi I am setting up a SwiftEMU hotel, although when loading client I experience a blank message box then a disconnection a few minutes later.

On my emulator it says CRITTCAL ERROR LOGGED.

In my critical exceptions log file:

TokenID: 0Invalid Dario bug duing user login: System.InvalidCastException: Specified cast is not valid.
   at Butterfly.HabboHotel.Users.Authenticator.HabboFactory.GenerateHabbo(DataRow dRow, DataRow group)
   at Butterfly.HabboHotel.Users.UserDataManagement.UserDataFactory.GetUserData(String sessionTicket, String ip, Byte& errorCode)
   at Butterfly.HabboHotel.GameClients.GameClient.tryLogin(String AuthTicket)

I have attempted to clear out tables in the database but still does not work.

[MentaL]

[RivRawr]

Download the emu off another Ragezone forum.

[The General]

Make sure there is a column called 'group' in your 'users' table.

Also any SQL errors logged?