Module "neopixel" not found

Hi guys,

Just playing around with my original Esp. and with only one line of code from the official LEDs example on the site, oddly I'm getting:

1v86 Copyright 2016 G.Williams
>ERROR: Could not open file : NO_PATH
WARNING: Module "neopixel" not found
Uncaught Error: Field or method "write" does not already exist, and can't create it on undefined
 at line 1 col 20
require("neopixel").write(B15, [255,0,0]);

Has something changed with how modules are required?