Are you running a TTT server?
Seems that addon requires TTT, or some other addon made for TTT.
"dmginfo" and "weapon_tttbase.lua" are two big clues on that in the error.
(has NOTHING to do with ULib btw...we just have a hook enhancement, so instead of gmod showing up, our file does)
If you are running a TTT server, find the original release for your addon and find out what else it's requirements are.