Error?

Starting to load DMaps.
Loading 1000 : C:\OldCODB\map/map/desert.DMap
Loading 1001 : C:\OldCODB\map/map/d_antre01.DMap
Loading 1002 : C:\OldCODB\map/map/newplain.DMap
Loading 1011 : C:\OldCODB\map/map/woods.DMap
Loading 1015 : C:\OldCODB\map/map/island.DMap
Loading 1020 : C:\OldCODB\map/map/canyon.DMap
Loading 1028 : C:\OldCODB\map/map/mine-four.DMap
Loading 1036 : C:\OldCODB\map/map/street.DMap
Loading 1037 : C:\OldCODB\map/map/faction-black.DMap
Loading 1038 : C:\OldCODB\map/map/faction.DMap
Loading 1039 : C:\OldCODB\map/map/playground.DMap
Loading 700 : C:\OldCODB\map/map/arena-none.DMap
Loading 1785 : C:\OldCODB\map/map/Halloween2007a.DMap
DMaps loaded successfully in 668 milliseconds.
Mobs loaded 5815

The server is ready for connections.
Always close the server by pressing Enter, or the important data wont't save.
System.BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)
   at NewestCOServer.Native.BF_set_key(IntPtr _key, Int32 len, Byte[] data)
   at NewestCOServer.Main.Blowfish.SetKey(Byte[] data) in C:\Users\HP\Desktop\server work\NewestCOServer\Main\Blowfish.cs:line 85
   at NewestCOServer.Main.GameCrypto..ctor(Byte[] key) in C:\Users\HP\Desktop\server work\NewestCOServer\Main\Blowfish.cs:line 15
   at NewestCOServer.Main.GameClient..ctor(Boolean Robot) in C:\Users\HP\Desktop\server work\NewestCOServer\Main\GameClient.cs:line 48
System.NullReferenceException: Object reference not set to an instance of an object.
   at NewestCOServer.Main.GameWorker.ConnectionHandler(StateObj S) in C:\Users\HP\Desktop\server work\NewestCOServer\Main\GameWorker.cs:line 33