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add_watch: cannot watch

Exception: Unable to update the server configuration with local parameters: Traceback (most recent call last):
...
pyinotify.WatchManagerError: add_watch: cannot watch /home/user/yocto/build/conf WD=-1, Errno=No space left on device (ENOSPC)

Solution is to increase max_user_watches 

echo fs.inotify.max_user_watches=65536 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p