I've been trying to run a server for me and my pals lately, and weve been TRYING to have battle bots with wooden bots, but everytime we get halfway into this the server crashes and I get this error. I have only a few mods installed:

ULib
ULX
Adv dupe
Stacker
Nocollide Multi

Is this due to addons? or a GMod issue itself? Thank you for any help.