SBoxLimit_ error

I’ve been running into this problem for a while now, every time I try to spawn a prop or pickup a swep off the ground it would give me an error like this:

Weapon example:
SBoxLimit_weapon_rpg
Though I still get this error popup on my right hand side, I can still pick it up and use the swep

Prop example:
SBoxLimit_models/props_c17_streetsign005d.mdl
When I get this popup error on the right hand side, I won’t be able to spawn any props

All my sbox limits such as props, lights, lamps, etc are set properly as well.

If anyone could help me out on solving this problem that would be great, thanks!

One of your addons is doing this.

It was URM which is causing the problem, thanks.