This error means that there are no valid wbem credentials. What os is the target server?
if it's a windows server you need an account that is local admin on the target server or you need to do a repair with admin rights to set an account that does not need to be admin. I would first try the admin account.
If you get the hng of it you can proceed with setting up a non admin account, this is a repair option. You only need an admin account to set this up.
But for now first try an admin account. Do you know how to set the credentials? You can either set it for one object, a group of discovery objects or general for all objects in SIM.
