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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
I imagine it's because you need to 'sign' your package? The private key is part of the Espruino repo, so if you clone it and then use this line you'll hopefully be sorted: https://github.com/espruino/Espruino/blob/master/make/common/NRF5X.make#L289