Error when running gulp watch: EMFILE, readdir

[grtjn]

Running gulp watch can sometimes result in messages like below. This typically occurs if you have multiple gulp/gulp watches open simultaniously..

[10:25:28] Using gulpfile .../gulpfile.js
[10:25:28] Starting 'jshint'...
[10:25:28] Finished 'jshint' after 5.22 ms
[10:25:28] Starting 'less'...
[10:25:28] Starting 'scripts'...
[10:25:28] Starting 'watch'...
[10:25:30] Finished 'watch' after 1.9 s

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: EMFILE, readdir '.../ui/app/bower_components/ng-ckeditor/libs/ckeditor/plugins/magicline/images'

[grtjn]

The solution is to run something like: ulimit -n 2048 (or check the current open file handle limit first with ulimit -a, and then doubling it till the message goes away)