Can't Build The Engine

hi everyone

i want to build the engine but i have following error:

at Error (native)
at Object.fs.openSync (fs.js:634:18)
at Object.fs.readFileSync (fs.js:502:33)
at C:\PlayCanvas\engine-master\build\build.js:174:25
at Array.forEach (native)
at preprocess (C:\PlayCanvas\engine-master\build\build.js:170:18
at C:\PlayCanvas\engine-master\build\build.js:236:25
at C:\PlayCanvas\engine-master\build\build.js:127:9
at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:439:3)

node : 6.2.2
npm : 3.9.5

What node version you have?
And what is your command line you try?