My server does not run commands.

So, the other day I was building with my friend. We finished building, and did a command /setjail jail2 and the command did not execute. It didn`t say anything in chat. And 15-30 seconds later it said Timed out. And now whenever I want to execute any command it repeats the same thing. Please help

Also, when I try reseting the server I get eror 504, then in order for my server to start I have to stop it and open it again instead of just reseting. Also it says that one player is online but no one is online.

Hello. Forgot to mention that commands like /gamemode 1 work. Alright now, on console it says datari (my name) issued server command /plugins
and nothing more. Its blank. I will share the log. The commands that did not execute are the last 3 lines on the log.
Log ink: https://mclo.gs/jHvFgSW
Now after closely reading the log there is an error. Im not sure what it means. Seems like problem with one of my plugins, Essentials.

EDIT: Fixed. Reinstalled essentials and everything works.