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You’re reaching the observer threshold of your system. Try to run this:
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
Visit here to learn more:
https://github.com/guard/listen/wiki/Increasing-the-amount-of-inotify-watchers#the-Technical-Details
Note: If you are using the npm install why use the yarn start? Uses the npm start or yarn install. This can create conflict in .lock
