Problem with Kobold Server

[neroneelfico]

Hi to all. I've istalled kobold server and configurate it. But when I open all server and open my wow client, when I do my login in there is an error:
Unable to validate game versione. This may be caused by file corruption or the interference of an other program.......

If I changed realmlist to official server there aren't problem... In my server LF I see
Accept: Client connected = [127.0.0.1] - [1712]
auth: checking ip 127.0.0.1
auth: checking ip 127.0.0.1 --> [OK]
auth: checking ip 127.0.0.1
auth: checking ip 127.0.0.1 --> [OK]
LogonSrv: Login Failed
auth: failed to auth client with error code[9]

Why?? Thank to all

[MentaL]