That means that your computer doesn't know how to log on to the other computer in order to access its share.
Once you have correctly configured your Hubs and satellites, you can start collaboration . You can create new Code Co-op projects on any machine, be it a Hub or a satellite. Similarly, you can invite others to your project or you can join existing projects.
Remember, when inviting or joining a project, you have to know whether the intended recipient is on your Hub or a differnet Hub or Email peer.
The first time computers on the LAN talk to each other, you might get a
logon failure alert:
That means that your computer doesn't know how to log on to the other computer
in order to access its share.
To remedy this, open your Network Neighborhood, find the share listed in the alert, and open it. You'll be prompted for a password. Enter the password and select the checkbox "remember password".