React Native version being used: 0.55.4view image description here
Encountering a similar problem, I resolved it by reinstalling the watchman package. For Mac users, try executing brew uninstall watchman followed by brew install watchman
It's possible that your 8081 port is currently being used by another process.
For the first solution, check out this troubleshooting guide https://facebook.github.io/react-native/docs/troubleshooting
$ sudo lsof -i :8081
$ kill -9
Once that is done,
$ cd YourProject
and
$ npm start
This should assist you in debugging the packager
sudo echo 256 >> /proc/sys/fs/inotify/max_user_instances
sudo echo 32768 >> /proc/sys/fs/inotify/max_queued_events
sudo echo 65536 >> /proc/sys/fs/inotify/max_user_watches
That's all folks!
Encountered an issue where watchman couldn't create a directory in /usr/local/var/run/watchman/-state. I decided to give access to the parent directory (although it may not have been necessary since it's likely system-accessible) and manually created the directory before retrying.
The missing directory path was identified through the metro terminal window.
After these adjustments, everything functioned correctly.
React Native has recently changed the port of the emulator, which may cause confusion for users of older versions. To resolve this issue, you can refer to this helpful link.
Good luck with sorting it out!
If you're experiencing an issue, it might be related to watchman. To address this, consider running the following commands (tested on Linux Ubuntu).
echo 256 | sudo tee -a /proc/sys/fs/inotify/max_user_instances
echo 32768 | sudo tee -a /proc/sys/fs/inotify/max_queued_events
echo 65536 | sudo tee -a /proc/sys/fs/inotify/max_user_watches
I personally found success with the above commands.
If you're struggling with Ubuntu issues, check out this helpful solution: https://example.com/ubuntu-solution-for-common-issues
sudo sysctl -w net.ipv4.tcp_wmem='4096 87380 16777216'
sudo sysctl -w net.ipv4.tcp_rmem='4096 87380 16777216'
sudo sed -i 's/GRUB_TIMEOUT=10/GRUB_TIMEOUT=5/g' /etc/default/grub
sudo update-grub
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