If you see this error trying while working on the command line of WatchGuard Firebox:
WG#configure %Error: The Device Administrator admin from x.x.x.x has selected Edit Mode. You cannot select Edit Mode until admin has selected View Mode.
This could mean that you are trying to run a command after you typed configure to enter the configuration mode and the command needs to be run in main mode.
If you are in configure mode you can type "exit" to return to the main, read only mode.
For example, when trying to run tcpdump on a Firebox in configure mode you would get this error because tcpdump should be run in the main, read only mode.
For more information refer to the latest version of the WatchGuard Firebox CLI Documentation