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-
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