samba - Oct 2004 - winbind log querstion.

Hi, I searched the archives and found alot of questions about this subject
but not any answers?
Maybe I searched to little, anyway here comes the question.

I have 2 log issues in the winbind log that I cant figure out.

[2004/10/21 09:22:51, 1] libsmb/clikrb5.c:ads_krb5_mk_req(313)
  krb5_cc_get_principal failed (No credentials cache found)

[2004/10/21 10:17:02, 1] nsswitch/winbindd_group.c:winbindd_getgroups(1059)
  user 'root' does not exist

I run debian 3.1 vanilla packets, no own compiled source...