title: Gulp error internal/child_process.js:298 throw errnoException(err, 'spawn'); Error: spawn EACCES
body: <p>I searched for the cause of this error and found that I have to change permissions or run gulp using sudo, but still got the same error.
  Can anyone please help...</p>
  
  <p>internal/child_process.js:298
      throw errnoException(err, 'spawn');
      ^</p>
  
  <p>Error: spawn EACCES
      at exports._errnoException (util.js:870:11)
      at ChildProcess.spawn (internal/child_process.js:298:11)
      at exports.spawn (child_process.js:362:9)
      at exports.execFile (child_process.js:151:15)
      at ExecBuffer. (/var/www/conFusion/node_modules/gulp-imagemin/node_modules/imagemin/node_modules/imagemin-optipng/node_modules/exec-buffer/index.js:91:3)
      at /var/www/conFusion/node_modules/gulp-rev/node_modules/vinyl-file/node_modules/graceful-fs/graceful-fs.js:42:10
      at /var/www/conFusion/node_modules/gulp-cache/node_modules/cache-swap/node_modules/graceful-fs/graceful-fs.js:42:10
      at /var/www/conFusion/node_modules/gulp-imagemin/node_modules/imagemin/node_modules/vinyl-fs/node_modules/graceful-fs/graceful-fs.js:42:10
      at FSReqWrap.oncomplete (fs.js:82:15)</p>