Some roaming agents you have selected are not supported under your current license edition

Some roaming agents you have selected are not supported under your current license edition

Hi,
I'm trying to use the Free version of Desktop Central and am getting an error when trying to approve a laptop.  Full error says:
Some roaming agents you have selected are not supported under your current license edition and will not be approved. Proceed anyway ?

I don't know what this error means as all I'm doing is adding one of my laptops into the system.  Can anyone shed any light on why it isn't working?

I also have a warning at the top of the screen that says:
You have exceeded the limit of adding Remote Offices   
Free Edition limits you to have only one remote office through Distribution Server.

I don't even know what a Remote Office is, but the only one I have is called Default Roaming Office and was created when I signed up for the service.

Help please.  ;)

Thanks.