When I update "gulp-uncss", there is a strange problem... It just stop when copying extracted folder... I tried many times... Each time is like this... I'm using "iojs-v1.0.4-x64", whether the cause of the problem is this?
I think you may have run into this bug https://github.com/giakki/uncss/issues/142 - it's not a problem with UnCSS, it is with io.js.