Radius couldnt start as service

Birol Ertekin ( ertekin@Pamukkale.escortnet.com )
Tue, 8 Jul 1997 23:27:23 +0300 (EET DST)

Hi there,
I installed radiusnt and emerald today, but couldn't manage to start
radiusnt as a nt service.
When I did:
radius -x15 it gave this error:
Users file couldn't opened.
I need your answers URGENTLY.
Best REgards.
Birol ERTEKIN
EscortNET
Istanbul,TURKEY