Range error when programming

Just updated a whole bunch of bots to the latest version of the firmware and I now can’t load even the smallest program into slots 1, 2 or 3. Modkit says Programming Successful but the brain shows a message near the top of the display that says Range Error (or something similar) and the programs do not download. These are small programs with just a couple of instructions. Slot 4 seems to work fine and I have successfully loaded large programs into this slot as well.

Edit: Ignore that, issue now sorted, my mistake entirely!