events.js:160 throw er; // Unhandled 'error' event

Question

The project I worked on was built with gulp.

Recently I updated the node version to v6.3.1. Then something came wrong.

A task named 'html' throws an error. Here is the part of error code of it.

bogon:toClient work$ gulp html
(node:2519) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.

[10:26:10] Using gulpfile ~/Project/TIME_Cancer_Treatment_Centers_of_America(CTCA)/toClient/gulpfile.js
[10:26:10] Starting 'html'...
(node:2519) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.

events.js:160
      throw er; // Unhandled 'error' event
      ^
Error: CSS parse error scripts/vendor.js: Unexpected input
    1 |!function(t,e){"object"==typeof module&&"object"==typeof module.exports?module.exports=t.document?e(t,!0):function(t){if(!t.document)throw new Error("jQuery requires a window with a document");return e(t)}:e(t)}("undefined"!=typeof window?window:this,function(t,e){function i(t){var e="length"in t&&t.length,i=J.type(t);return"function"!==i&&!J.isWindow(t)&&(!(1!==t.nodeType||!e)||("array"===i||0===e||

And the code of task 'html':

var $ = require('gulp-load-plugins')();

gulp.task('html', function() {
  var assets = $.useref.assets({searchPath: ['.tmp']});

  return gulp.src('app/*.html')
    .pipe(assets)
    .pipe($.if('*.js', $.uglify()))
    .pipe($.if('*.css', $.csso()))
    .pipe(assets.restore())
    .pipe($.useref())
    .pipe($.if('*.html', $.minifyHtml({conditionals: true, loose: true})))
    .pipe(gulp.dest('dist'));
});

I googled a lot but I haven't found a proper answer suitable for me.

Answer 1

removing the node_modules folder, clearing npm cached files, and doing a fresh install, resolves this issue.

rm -rf node_modules && npm cache clean --force && npm install

source: https://github.com/ember-cli/ember-cli/issues/3087#issuecomment-71327402

Answer 2

Regarding the error at the following line:

events.js:160
      throw er; // Unhandled 'error' event

The issue for me was that I already had the port open on another local node app.

Stopping the other app resolved the issue.