Butterfly Emulator Error

Hi Everyone, When opening the client I get this error:
http://i.imgur.com/AH6SHgV.png

It only did this after I replaced the Butterstorm catalog_pages, catalog_items_copy and items_base with the English edits..

Code:

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TokenID: 0Invalid Dario bug duing user login: System.NullReferenceException: Object reference not set to an instance of an object.
  at Butterfly.HabboHotel.Items.UserItem..ctor(UInt32 Id, UInt32 BaseItem, String ExtraData, UInt32 rareid, String groupstring) in c:\Users\Leon\Desktop\Development\C#\BcStorm\Butterfly\HabboHotel\Items\UserItem.cs:line 30
  at Butterfly.HabboHotel.Users.UserDataManagement.UserDataFactory.GetUserData(String sessionTicket, String ip, Byte& errorCode) in c:\Users\Leon\Desktop\Development\C#\BcStorm\Butterfly\HabboHotel\Users\UserDataManagement\UserDataFactory.cs:line 232
  at Butterfly.HabboHotel.GameClients.GameClient.tryLogin(String AuthTicket) in c:\Users\Leon\Desktop\Development\C#\BcStorm\Butterfly\HabboHotel\GameClients\GameClient.cs:line 241

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Please help,
-Lucas