Required KADM5 principal missing while initializing kadmin interface

Hello,
I was just following the strictly required steps to manually set up a Kerberos client.
When I came to the required step of adding the host principal I got the following error:

s10u9-client:~ # kadmin -p user1/admin
Authenticating as principal user1/admin with password.
kadmin: Database error! Required KADM5 principal missing while initializing kadmin interface

The client /etc/krb5/krb5.conf is as follows:

[libdefaults]
        default_realm = X.DOMAIN.COM

[realms]
        X.REALM.COM = {
        kdc = kdc1.y.domain.com
        kdc = kdc2.y.domain.com
        kdc = kdc3.y.domain.com
        admin_server = kdc1.y.domain.com
        kpasswd_protocol = SET_CHANGE