version:
gulp@3.9.1
I have installed semantic-ui through npm install and given default settings durin
There is an issue with gulp-header 1.8.3 causing this.
https://github.com/tracker1/gulp-header/issues/37
Add "gulp-header": "1.8.2" directly to your package.json and you should be fine.
Remove the ^ from the version number if it's already there, it pushes you up to the next minor version, which will cause the problem.