gulpfile.js

var gulp = require('gulp');
var less = require('gulp-less');
var autoprefixer = require('gulp-autoprefixer');
var browserSync = require('browser-sync').create();

gulp.task('css', function () {
    return gulp.src('less/main.less')
        .pipe(less())
        
        // THIS FCKING SOLUTION! FCK YEAH!
        .on('error', function (e) {
            console.log(e.message);
            this.emit('end');
        })
        .pipe(autoprefixer({
            browsers: ['last 2 versions'],
            cascade: false
        }))
        .pipe(gulp.dest('./css'))
        .pipe(browserSync.stream());
});

// Static server
gulp.task('serve', function() {
    browserSync.init({
        server: {
            baseDir: './'
        }
    });

    gulp.watch('*.html').on('change', browserSync.reload);
    gulp.watch('less/*.less', ['css']);
});

gulp.task('default', ['serve']);