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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.
@stweedo
I think that's a typo in the tutorial. It should be named app-icon.js for the 48x48 pixel icon image that gets stored directly on the bangle watch when it is uploaded from the app loader.
I'm not sure about the other error.