title: Why does Gulp.js throw a Bus Error: 10 with gulp.watch?
body: <p>I keep getting a <code>Bus error: 10</code> with <code>gulp.watch()</code> after a watched file changes.</p>
  
  <p>Why does the <code>Bus error</code> happen with a valid gulpfile?</p>
  
  <p>Here is my gulpfile:</p>
  
  <pre><code>var gulp = require('gulp');
  var minifycss = require('gulp-minify-css');
  
  gulp.task('css', function() {
    return gulp.src('css/*.css')
      .pipe(minifycss())
      .pipe(gulp.dest('css/min'));
  });
  
  gulp.task('default', function() {
    gulp.watch('css/*.css', ['css']);
  });
  </code></pre>