Not working with Economics

[21:44:53] > Loaded plugin Purchase Vehicles from the Shop v1.0.7 by M&B-Studios
[21:45:01] > Failed to call hook 'cmdBuy' on plugin 'VehicleBuy v1.0.7' (InvalidCastException: Null object cannot be converted to a value type.)
  at System.Convert.ChangeType (System.Object value, System.Type conversionType, System.IFormatProvider provider) [0x00019] in <47fc8c70fa834cbf8141d7c1a7589125>:0 
  at System.Convert.ChangeType (System.Object value, System.Type conversionType) [0x00007] in <47fc8c70fa834cbf8141d7c1a7589125>:0 
  at Oxide.Core.Plugins.Plugin.Call[T] (System.String hook, System.Object[] args) [0x00008] in <b76ec77c47d1449e92b2baab8603843d>:0 
  at Oxide.Plugins.VehicleBuy.GetBalance (BasePlayer player, Oxide.Plugins.VehicleBuy+VehicleInfo product) [0x0003d] in <38c5c8cdd4bc4c88957abfb7337cd62b>:0 
  at Oxide.Plugins.VehicleBuy.CanBuy (BasePlayer player, Oxide.Plugins.VehicleBuy+VehicleInfo product) [0x0004a] in <38c5c8cdd4bc4c88957abfb7337cd62b>:0 
  at Oxide.Plugins.VehicleBuy.Collect (BasePlayer player, Oxide.Plugins.VehicleBuy+VehicleInfo product) [0x00000] in <38c5c8cdd4bc4c88957abfb7337cd62b>:0 
  at Oxide.Plugins.VehicleBuy.cmdBuy (ConsoleSystem+Arg arg) [0x000b9] in <38c5c8cdd4bc4c88957abfb7337cd62b>:0 
  at Oxide.Plugins.VehicleBuy.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00bd8] in <38c5c8cdd4bc4c88957abfb7337cd62b>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <cd9a02fd331347bd82d550bb1a9c8e9f>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <b76ec77c47d1449e92b2baab8603843d>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <b76ec77c47d1449e92b2baab8603843d>:0 
 

Send me your config please 

VehicleBuy.json

I will fix the error today.

Thank you again I love the plugin it's very user friendly  great work I will be as much help in the testing phase as I can

Thank you
I will also rework the command
and
Add the permissions

Changed Status from Pending to Closed

Changed Fixed In to 1.0.8