Adding sass instead of less. Use gulp-sass: npm install --save-dev gulp-sass
var gulp = require('gulp');
var sass = require('gulp-sass');
gulp.task('styles', function() {
gulp.src('sass/**/*.scss')
.pipe(sass({
errLogToConsole: true
}))
.pipe(gulp.dest('./css/'))
});
//Watch task
gulp.task('default',function() {
gulp.watch('sass/**/*.scss',['styles']);
});