depending on the MOD you're mapping for, the model you used needs to be:
C:Program FilesSteamSteam
Appsyour@email.comdayofdefeatdod(or is it valve?!)models
mapmodelsthe error you got is caused by not having the model that's in the map, in the right place in your mod directory.
make sure the pathname is correct, make sure the model name is correct, make sure it's in the right folder.
simple as that.