[HELP] unknown column `online` help

i keep getting this error when i start my emu Screenshot by Lightshot how can i fix this

Is the column missing from the database, if so then add it?

how do i add it?

Might not be users table, could be players or members table idk, you'll have to have a look at the database

Code:

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ALTER TABLE `users` ADD `online` enum('0','1') NOT NULL DEFAULT '0';

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Ok thanks ive done that now i get this error...

Code:

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Critical error in HandleData stack: Specified cast is not valid.

  at Reality.Game.Characters.CharacterInfoLoader.GenerateCharacterInfoFromRow(SqlDatabaseClient MySqlClient, UInt32 LinkedClientId, DataRow Row) in C:\Users\coolp_000\Desktop\rp3\Game\Characters\CharacterInfoLoader.cs:line 110
  at Reality.Game.Characters.CharacterInfoLoader.GetCharacterInfo(SqlDatabaseClient MySqlClient, UInt32 CharacterId, UInt32 LinkedClientId, Boolean IgnoreCache) in C:\Users\coolp_000\Desktop\rp3\Game\Characters\CharacterInfoLoader.cs:line 102
  at Reality.Game.Sessions.Session.TryAuthenticate(String Ticket, String RemoteAddress) in C:\Users\coolp_000\Desktop\rp3\Game\Sessions\Session.cs:line 367
  at Reality.Game.Handlers.Handshake.SsoLogin(Session Session, ClientMessage Message) in C:\Users\coolp_000\Desktop\rp3\Game\Handlers\Handshake.cs:line 44
  at Reality.Communication.Incoming.DataRouter.HandleData(Session Session, ClientMessage Message) in C:\Users\coolp_000\Desktop\rp3\Communication\Incoming\DataRouter.cs:line 69
  at Reality.Game.Sessions.Session.ProcessData(Byte[] Data) in C:\Users\coolp_000\Desktop\rp3\Game\Sessions\Session.cs:line 612

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