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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
It looks like error 0x3401 is BLE_ERROR_NOT_ENABLED (although I've never seen that reported before!).
I think the issue is that you've enabled BLE HID with setServices, but then you're still connected by Bluetooth so the Puck can't restart the bluetooth stack to enable HID - hence the:
message...
So all you need to do is upload your code, then disconnect and reconnect (which will allow the PC to detect that the Puck is now also a Bluetooth keyboard) and then everything should be fine