samba - Apr 2009 - net usersidlist

Does anybody know the requirements to use the net usersidlist command?  
I always get the below:

# net usersidlist
[2009/04/27 10:14:15, 0] utils/net_rpc.c:net_usersidlist(4731)
   Could not get the user/sid list

Thanks in advance.

d