any idea what this is?

o.reload VehicleBuy
[CSharp] Started Oxide.Compiler v successfully
VehicleBuy was compiled successfully in 1796ms
Unloaded plugin Purchase Vehicles from the Shop v2.0.5 by M&B-Studios
Failed to call hook 'OnServerInitialized' on plugin 'VehicleBuy v2.0.5' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.VehicleBuy.SetupVendingMachine (BaseEntity machine, VendingMachine comp, System.Collections.Generic.List`1[T] items) [0x000ac] in <431161240e2c4f31997e06a7e9b9b23e>:0 
  at Oxide.Plugins.VehicleBuy.SpawnVendingMachines () [0x00042] in <431161240e2c4f31997e06a7e9b9b23e>:0 
  at Oxide.Plugins.VehicleBuy.OnServerInitialized () [0x0056e] in <431161240e2c4f31997e06a7e9b9b23e>:0 
  at Oxide.Plugins.VehicleBuy.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00c4a] in <431161240e2c4f31997e06a7e9b9b23e>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <206a0f2c6ee141f38e2ad549cde44d70>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <beb2b64691c64e2b95b99491bd85442c>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <beb2b64691c64e2b95b99491bd85442c>:0 
Calling 'OnServerInitialized' on 'VehicleBuy v2.0.5' took 114ms
Loaded plugin Purchase Vehicles from the Shop v2.0.5 by M&B-Studios
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: attackheli.image_0 - Image URL: https://rustlabs.com/img/screenshots/attack-helicopter.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: car2.image_0 - Image URL: https://rustlabs.com/img/screenshots/modular-vehicle-2.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: car3.image_0 - Image URL: https://rustlabs.com/img/screenshots/modular-vehicle-3.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: car4.image_0 - Image URL: https://rustlabs.com/img/screenshots/modular-vehicle-4.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: copter.image_0 - Image URL: https://rustlabs.com/img/screenshots/minicopter.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: duosub.image_0 - Image URL: https://rustlabs.com/img/screenshots/submarine-duo.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: horse.image_0 - Image URL: https://rustlabs.com/img/screenshots/ridable-horse.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: hotairballoon.image_0 - Image URL: https://rustlabs.com/img/screenshots/balloon.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: recycler.image_0 - Image URL: https://rustlabs.com/img/screenshots/recycler.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: rhib.image_0 - Image URL: https://rustlabs.com/img/screenshots/rhib.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: rowboat.image_0 - Image URL: https://rustlabs.com/img/screenshots/rowboat.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: scrapheli.image_0 - Image URL: https://rustlabs.com/img/screenshots/scrap-heli.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: snowmobile.image_0 - Image URL: https://rustlabs.com/img/screenshots/snowmobile.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: solosub.image_0 - Image URL: https://rustlabs.com/img/screenshots/submarine-solo.png
Image failed to download! Error: HTTP/1.1 403 Forbidden - Image Name: tugboat.image_0 - Image URL: https://rustlabs.com/img/screenshots/tugboat.png

Just started happening today? not sure what changed

I removed my config and did a fresh install, the errors have gone away but there is still no images for most. 

Are you using oxide and ImageLibrary?

yes i am, i even reloaded image library

I decided to use the refresh command for  ImageLibrary and then reloaded VehicleBuy, all of the images are now showing. I'm not sure what happened as I haven't added any new plugins or made any changes to my server in a while. But wanted you to know everything is good now. Thanks much

Great! Apparently, we should give up using ImageLibrary.