Waterfall Error Pls Help


Can someone help me?
After I restart waterfall it stops printing this error but after some time
maby 6-8 hour or more it starts to repeat this error when when player joins.


Plugins that I use are: luckperms, clientstats, ultra stuffchat, advancedbun, authmebungee, bungee ping, chatsentinel, botsentry.

Also when player joins/leaves it prints this message:
WARN Event PlayerDisconnectEvent(player=Azo) took 282ms to process!