I have a problem with kadmin

[Adrián Hernández]

Hi
I have a problems with kadmin, when I try to manage my kerberos database, I 
got this error:

[SHELL]# kadmin -p administrador/admin
Authenticating as principal administrador/admin with password.
Password for administrador/admin at UPIITA.IPN.MX:
kadmin: GSS-API (or Kerberos) error while initializing kadmin interface

What can I do?

Thank you.