Gulpfile with Sass error notify

Gulpfile.js

var gulp = require('gulp'),
    uglify = require('gulp-uglify'),
    watch = require('gulp-watch'),
    notify = require('gulp-notify'),
    browserSync = require('browser-sync').create()
    sass = require('gulp-sass'),
    neat = require('node-neat').includePaths;

var paths = {
  scripts: ['_src/js/**/*.js', '!dist/js/**/*.js'],
  scss: ['_src/scss/**/*.scss']
};

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

  gulp.watch(paths.scss, ['sass']);
  gulp.watch('*.html').on('change', browserSync.reload);
});

gulp.task('sass', function() {
  gulp.src('_src/scss/*.scss')
    .pipe(sass({
      includePaths: ['sass'].concat(neat)
    }))
    .on('error', function(err) {
      console.log(err.message);
      return notify().write(err); // send the error through Growl
    })
    .pipe(gulp.dest('./dist/css'))
    .pipe(browserSync.stream())
    .pipe(notify('Sass compiled successfully.'))
});

gulp.task('js', function() {
  gulp.src('_src/js/*.js')
    .pipe(uglify())
    .pipe(gulp.dest('dist/js'))
    .pipe(notify('Finished minifying JS.'));
});

gulp.task('watch', function() {
  gulp.watch(paths.scripts, ['js']);
});

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