An attempt was made to create a connection between nodes on different channels, but no routers were available to complete a logical path between the channels.
This error can occur when attempting to remove or move a router which has connections across it, or a router which connects an NSI to either the LNS or another NSI
Lon Maker will not allow the disconnection of a router if the logical path to the device is broken. To combat this you must be creative by adding temporary routers, moving the devices to the new temporary channel, which will create a new path to the devices. the old Routers can then be removed/replaced and the devices can now be returned. Delete any temporary routers/channels.