samba - Jun 2004 - problem with change password from a PC

Dear all,
When I want change password from a pc by control_alt_delete I nann't
and see this message from samba: Please help me.
[2004/06/06 15:30:53, 0] lib/util_sec.c:assert_gid(114)
  Failed to set gid privileges to (0,99) now set to (0,-1) uid=(0,99)
[2004/06/06 15:30:53, 0] lib/util.c:smb_panic(1094)
  PANIC: failed to set gid


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Good luck,
_Mohseni.