title: Gulp-watch do not work, can not run it
body: <p>I have gulpfile.js</p>
  
  <pre><code>var gulp = require('gulp'),
  browserSync = require('browser-sync');
  var clean = require('gulp-clean');
  var concat = require('gulp-concat');
  var uglify = require('gulp-uglify');
  var less = require('gulp-less');
  var livereload = require('gulp-livereload');
  var watch = require('gulp-watch');
  var minifycss = require('gulp-minify-css');
  
  gulp.task('browserSync', function () {
    var files = ['app/**'];
  
   browserSync.init(files, {
      server: {
         baseDir: 'app/',
         index: 'index.html'
      },
     logPrefix: 'Ex02xAth', 
     browser: ['chrome', 'opera', 'firefox']
   });
  });
  
  gulp.task('clean', function(){
    return gulp.src('app/tmp/*', {read: false})  
     .pipe(clean());
  });
  
  gulp.task('slucovac', function(){
    return gulp.src('app/lib/*.js')
     .pipe(concat('all.js')) 
     .pipe(gulp.dest('app/built/'));
  });
  
  gulp.task('komprese', function(){
    return gulp.src('app/lib/*.js')
    .pipe(uglify())
    .pipe(gulp.dest('app/minjs/'));
  });
  
  gulp.task('watch', function () {
    var watcher = gulp.watch('app/html/*.tmpl.html', ['build']);
    watcher.on('change', function (event) {
      console.log('Event type: ' + event.type); // added, changed, or deleted
      console.log('Event path: ' + event.path); // The path of the modified file
    });
  });
  
  gulp.task('less', function(){
    gulp.src('app/less/*.less')
     .pipe(watch())
     .pipe(less())
     .pipe(gulp.dest('app/css/'))
     .pipe(livereload());
  });  
  
  gulp.task('minifycss', function() {
    gulp.src('app/css/*.css')
     .pipe(minifycss())
     .pipe(gulp.dest('app/cssmin/'));
  });
  
  gulp.task('default', ['slucovac', 'komprese', 'minifycss', 'browserSync']);
  </code></pre>
  
  <p>When I run <code>gulp less</code> command line wrote: 
      "Error in plugin 'gulp-watch'. Message: glob argument required."</p>
  
  <p>I proceeded according this article: <a href="http://www.smashingmagazine.com/2014/06/11/building-with-gulp/" rel="nofollow">http://www.smashingmagazine.com/2014/06/11/building-with-gulp/</a></p>
  
  <p>Can I ask for help? Thanks</p>