title: gulp-uglify events.js unhandled 'error' event
body: <p>I'm getting this error. Running gulp yesterday worked perfectly fine, but this morning (changed NO code) and I'm getting this error.</p>
  
  <pre><code>$ gulp
  [08:54:10] Using gulpfile C:\Source\Source2\bunny-meadows\gulpfile.js
  [08:54:10] Starting 'scripts'...
  [08:54:10] 'scripts' errored after 11 ms
  [08:54:10] TypeError: listener must be a function
      at TypeError (&lt;anonymous&gt;)
      at DestroyableTransform.addListener (events.js:130:11)
      at DestroyableTransform.Readable.on (C:\Source\Source2\bunny-meadows\node_mo
  dules\gulp-uglify\node_modules\through2\node_modules\readable-stream\lib\_stream
  _readable.js:729:33)
      at Gulp.&lt;anonymous&gt; (C:\Source\Source2\bunny-meadows\gulpfile.js:37:10)
      at module.exports (C:\Source\Source2\bunny-meadows\node_modules\gulp\node_mo
  dules\orchestrator\lib\runTask.js:34:7)
      at Gulp.Orchestrator._runTask (C:\Source\Source2\bunny-meadows\node_modules\
  gulp\node_modules\orchestrator\index.js:273:3)
      at Gulp.Orchestrator._runStep (C:\Source\Source2\bunny-meadows\node_modules\
  gulp\node_modules\orchestrator\index.js:214:10)
      at Gulp.Orchestrator.start (C:\Source\Source2\bunny-meadows\node_modules\gul
  p\node_modules\orchestrator\index.js:134:8)
      at c:\Users\hschillig.SCDL\AppData\Roaming\npm\node_modules\gulp\bin\gulp.js
  :129:20
      at process._tickCallback (node.js:419:13)
  
  events.js:72
          throw er; // Unhandled 'error' event
                ^
  Error
      at new JS_Parse_Error (C:\Source\Source2\bunny-meadows\node_modules\gulp-ugl
  ify\node_modules\uglify-js\lib\parse.js:196:18)
      at js_error (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\node_m
  odules\uglify-js\lib\parse.js:204:11)
      at croak (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\node_modu
  les\uglify-js\lib\parse.js:675:9)
      at token_error (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\nod
  e_modules\uglify-js\lib\parse.js:683:9)
      at expect_token (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\no
  de_modules\uglify-js\lib\parse.js:696:9)
      at expect (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\node_mod
  ules\uglify-js\lib\parse.js:699:36)
      at function_ (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\node_
  modules\uglify-js\lib\parse.js:959:9)
      at expr_atom (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\node_
  modules\uglify-js\lib\parse.js:1188:24)
      at maybe_unary (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\nod
  e_modules\uglify-js\lib\parse.js:1358:19)
      at expr_ops (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\node_m
  odules\uglify-js\lib\parse.js:1393:24)
      at maybe_conditional (C:\Source\Source2\bunny-meadows\node_modules\gulp-ugli
  fy\node_modules\uglify-js\lib\parse.js:1398:20)
      at maybe_assign (C:\Source\Source2\bunny-meadows\node_modules\gulp-uglify\no
  de_modules\uglify-js\lib\parse.js:1422:20)
  </code></pre>
  
  <p>My gulpfile.js looks like this:</p>
  
  <pre><code>var gulp = require('gulp');
  
  // Include Our Plugins
  var concat = require('gulp-concat');
  var uglify = require('gulp-uglify');
  var rename = require('gulp-rename');
  var livereload = require('gulp-livereload');
  
  var paths = {
      // using framework version of jquery
      scripts: [
          'public/assets/js/jquery.min.js',
          'public/assets/plugins/mustachejs/mustache.js',
          'public/assets/js/modernizr.js',
          'public/assets/js/bootstrap.min.js',
          'public/assets/js/placeholders.min.js',
          'public/assets/plugins/bootstrap-wysiwyg/bootstrap3-wysihtml5.all.min.js',
          'public/assets/plugins/bootstrap-wysiwyg/bootstrap3-wysihtml5.min.js',
          'public/assets/plugins/responsiveslides/responsiveslides.min.js',
          'public/assets/plugins/bxslider/jquery.bxslider.min.js',
          'public/assets/plugins/magnific-popup/magnific-popup.js',
          'public/assets/js/jquery.autocomplete.min.js',
          'public/assets/js/plugins/additems.js',
          'public/assets/js/plugins/farm/farm.js',
          'public/assets/js/plugins/plusminus.js',
          'public/assets/js/core.js'
      ]
  };
  
  // Concatenate &amp; Minify JS
  gulp.task('scripts', function() {
      return gulp.src(paths.scripts)
          .pipe(concat('all.js'))
          .pipe(gulp.dest('public/assets/js'))
          .pipe(rename('all.min.js'))
          .pipe(uglify())
          .on('error')
          .pipe(gulp.dest('public/assets/js'))
          .pipe(livereload());
  });
  
  // Watch Files For Changes
  gulp.task('watch', function() {
      livereload.listen();
      gulp.watch(paths.scripts, ['scripts']);
  });
  
  // Default Task
  gulp.task('default', ['scripts', 'watch']);
  </code></pre>
  
  <p>Again I didn't change anything so I don't get why all of a sudden this morning it doesn't want to work.</p>