What's the module you're requiring? Espruino's IDE won't pull in modules from NPM, it will only pull in the modules on the Espruino site. http://www.espruino.com/Modules
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.
What's the module you're requiring? Espruino's IDE won't pull in modules from NPM, it will only pull in the modules on the Espruino site. http://www.espruino.com/Modules
Also, you may be trying to use the module on the left-hand side of the IDE without having uploaded code in the right hand side that uses it? http://www.espruino.com/Troubleshooting#i-get-uncaught-error-module-xyz-not-found-