I receive the above error message when trying to move the network interface to a different channel for trouble shooting purposes.
It is possible to create a network in LonMaker that has channels but no routers connecting the channels. LonMaker will assign different subnet node ids to devices on these channels. The channels and devices exist in complete isolation. Devices on the same channels can be bound together using the LonMaker connection tool but without routers the error will be shown if you create a binding to and from deivces on separate channels.
The error will also be shown if there are no routers joining the channels and have created a monitoring set and then attempt to move the network interface. To work around this problem remove the monitoring and then move the interface.