Cars can't be purchased from car dealer

Garry's Mod general
#1 

[ERROR] addons/3d_car_dealer/lua/autorun/3dcardealer_shopvgui.lua:226: attempt to call method 'Notify' (a nil value)
  1. func - addons/3d_car_dealer/lua/autorun/3dcardealer_shopvgui.lua:226
   2. unknown - lua/includes/extensions/net.lua:32

Upon clicking the buy button, nothing happens and it gives the error above in the server console. ^

It was working perfectly fine a week ago, now it’s not working properly.

All help is very appreciated. :alien:

#2

Is this Rockermania’s?

#3

Ye

#4

Make an issue with him on gmodstore.