i got that error from console:
[19:37:18] [luckperms-hikari housekeeper/WARN]: luckperms-hikari - Thread starvation or clock leap detected (housekeeper delta=1m4s636ms419µs697ns).

And all players kicked from the server.
Kick reason (i don't think it will help): Internal Exception: java.io.IOException: An established connection was aborted by the software in your host machine

My question is whats that error and can that have something to do with it?

i found this. not sure if have a hosted server or a local server. might help. brettwooldridge/HikariCP#679

The LuckPerms message is just a warning from Hikari that your server is lagging. It is not the cause.