If you're not seeing any options for devices to connect to, it might be because your nw.js and node versions don't match. If that's the case you need to manually rebuild all the 'native' modules.
I'd work out which version of nw.js you need and install that directly from the nw.js site (not NPM).
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.
Which operating system is this on?
You might be missing:
I'd work out which version of nw.js you need and install that directly from the nw.js site (not NPM).