Error Vehicle Script.lua

I just added 3D Car Dealer 3.5X to my Dark RP server, When you get in the car This comes up. SOmeone please help me

[ERROR] lua/autorun/client/clientvehiclescript.lua:14: attempt to index global ‘gmod_vehicle_viewmode’ (a nil value)

  1. fn - lua/autorun/client/clientvehiclescript.lua:14
  2. unknown - addons/ulib/lua/ulib/shared/hook.lua:183

TEST [lua/autorun/client/clientconsoledata.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scar3rdperson.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scarconsole.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scareditor.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scarhud.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scarracehud.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scarracemessages.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scarradio.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scarsetcarkey.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scarsseatanim.lua][lua/autorun/client/clientvehiclescript.lua]
TEST [lua/autorun/client/scartab.lua][lua/autorun/client/clientvehiclescript.lua]

[ERROR] lua/autorun/client/clientvehiclescript.lua:14: attempt to index global ‘gmod_vehicle_viewmode’ (a nil value)

  1. fn - lua/autorun/client/clientvehiclescript.lua:14
  2. unknown - addons/ulib/lua/ulib/shared/hook.lua:183