There is a problem with your worker threads
Check that your ~/frappe-bench/config/supervisor.conf is correctly formulated
cat ~/frappe-bench/config/supervisor.conf
and then share the last few lines from [group:frappe-bench-workers] onwards
You can also try the option recommended here… which is
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
bench restart