Looks like you got a crappy add-on which allows players to spam the console.Start the server again, type trace(1); in the server console, and hope he comes back and does it again. Then post the console.log and we'll be able to see what it is.
I contacted DragonoidSlayer, he said he had no idea what caused that and how you do it, so I think I'm out of luck.
Well, generally people messing with your stuff will act like they have no idea what you're talking about when confronted with it.
Well, he won't come back and do it again, so what do I do?
or find the addon causing it
The log is full of error message, you have a giant load of garbage add-ons.
Which ones do I get rid of tho
Everything, then start over by getting only the add-ons you really need for your server.
Vehicle_ThorWeapon_Ekko_TimeBatWeapon_PortalGun99.99% of errors just from those.