White/black models in my gmod

White/black models in my gmod
Some props that are from Left 4 dead 2 spawn without a model or something. They appear white and sometimes change to black or green.
I check in the console and it says:
MDLCache: props_misc/standing_tarp_tall.mdl uses a different model version to the engine (got 49, expected 48) ** standing_tarp_tall.mdl is an example**

I really don’t know why this happen. I have Lfd2 (original) and it still happening!! Any help?

l4d2 runs on a different version of the engine than gmod i’m pretty sure