ESP8266 + NodeMCU Custom Build + WS2812 Not Working

Question

I got this build on my ESP8266-12E using

Vins-MacBook-Pro:esptool-master vin$ sudo ./esptool.py --port /dev/tty.SLAB_USBtoUART write_flash -fm qio 0x00000 nodemcu-dev-8-modules-2017-02-23-16-42-03-integer.bin 

NodeMCU custom build by frightanic.com
branch: dev
commit: b382a42057a264eba55e3781e18143f52e0b426e
SSL: false
modules: file,gpio,net,node,tmr,uart,wifi,ws2812
build   built on: 2017-02-23 16:41
powered by Lua 5.1.4 on SDK 2.0.0(656edbf)

1)When I execute following in ESPlorer

ws2812.init()
ws2812.write(string.char(255, 0, 0, 255, 0, 0))

console shows following & no ws2812b pixel lights up.

ws2812.init()ws2812.write(string.char(255, 0, 0, 255, 0, 0))

2)When I execute following in ESPlorer

ws2812.init()
ws2812.write(1,string.char(255, 0, 0, 255, 0, 0))

console shows following & no ws2812b pixel lights up.

ws2812.init()ws2812.write(1,string.char(255, 0, 0, 255, 0, 0))
stdin:1: bad argument #1 to writ

Please guide, Thank You!

Answer 1

Please see my comments to the question. It will help someone else having same issues.