inotify_add_watch -- failed: "No space left on device"
The error message doesn't actually refer to the amount of storage space, but to the amount of inotify watches that are available for a given file system (see also here: https://github.com/guard/listen/wiki/Increasing-the-amount-of-inotify-watchers).
The quick solution (taken from the above website) would be to run
echo fs.inotify.max_user_watches=65536 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
Regards, Florian