Can't get Gulp to run: cannot find module 'gulp-util'

运行gulp一直报

Can't get Gulp to run: cannot find module 'gulp-util'

奇怪的是gulp_util包是存在的，后来用简单粗暴的方式解决

npm remove -g bower
npm remove -g gulp

npm install -g bower
npm install -g gulp

再次运行就好了