My NPM install failed?
Please make sure you have the latest version of gulp CLI. You will need to remove your current gulp global package before installing v4 in order to do an upgrade.
# Uninstall previous Gulp installation and related packages, if any $ npm rm gulp -g $ npm rm gulp-cli -g $ cd [your-project-dir/] $ npm rm gulp --save-dev $ npm rm gulp --save $ npm rm gulp --save-optional $ npm cache clean # Install the latest Gulp CLI tools globally $ npm install gulpjs/gulp-cli -g # Install Gulp 4 into your project from 4.0 GitHub branch as dev dependency $ npm install gulpjs/gulp#4.0 --save-dev # Check the versions installed. Make sure your versions are not lower than shown. $ gulp -v --- [10:48:35] CLI version 1.2.2 [10:48:35] Local version 4.0.0-alpha.2