Webpack has not enough watchers

Not enough watchers Verify that if you have enough available watchers in your system. If this value is too low, the file watcher in Webpack won’t recognize the changes:

cat /proc/sys/fs/inotify/max_user_watches

Arch users, add fs.inotify.max_user_watches=524288 to /etc/sysctl.d/99-sysctl.conf and then execute sysctl –system.

Ubuntu users (and possibly others):

echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p