Asset Forge gets stuck starting up after I added the Nature Kit (Classic) from Kenney Game Assets All-in-1.
- other kits are loading fine (Fantasy Town, Food, Nature, Platformer, Survival Kits)
- the way I add them is by linking each kit's `Models/OBJ format` folder into AF `Collections`.
I could not isolate a single faulty model, since they all fail. Somehow Nature Kit Classic comes with an extra `Materials` folder in the `Models` folder. I tried removing it, of copying its `.mat` files in the collection folder, to no avail.
Other info I can report:
- I'm running the linux version
- this is happening with both v2.1 and the the new v2.2 of the asset pack
- this is the content of `~/.config/unity3d/Kenney/Asset\ Forge/Player.log`:
```
Desktop is 1920 x 1080 @ 60 Hz
Initialize engine version: 2018.4.32f1 (fba45da84107)
GfxDevice: creating device client; threaded=1
Renderer: NVIDIA GeForce GTX 960/PCIe/SSE2
Vendor: NVIDIA Corporation
Version: 4.5.0 NVIDIA 525.147.05
GLES: 0 GL_AMD_multi_draw_indirect GL_AMD_seamless_cubemap_per_texture
[skipping a bunch of GL_* props]
Begin MonoManager ReloadAssembly
- Completed reload, in 0.023 seconds
Default vsync count 0
requesting resize 1920 x 1051
resizing window to 1920 x 1051
Desktop is 1920 x 1080 @ 60 Hz
UnloadTime: 0.391000 ms
requesting resize 1920 x 1051
resizing window to 1920 x 1051
Desktop is 1920 x 1080 @ 60 Hz
ArgumentNullException: Value cannot be null.
Parameter name: shader at (wrapper managed-to-native) UnityEngine.Material.CreateWithShader(UnityEngine.Material,UnityEngine.Shader) at UnityEngine.Material..ctor (UnityEngine.Shader shader) [0x00007] in <3b3eb4e308d8437b93d50c4c5ea504da>:0
at Dummiesman.OBJLoaderHelper.CreateNullMaterial () [0x0000a] in <7a3b30ffd72c450c8a1785d96f8ab24c>:0
at Dummiesman.OBJObjectBuilder.Build () [0x00051] in <7a3b30ffd72c450c8a1785d96f8ab24c>:0
at Dummiesman.OBJLoader.Load (System.IO.Stream input) [0x0037f] in <7a3b30ffd72c450c8a1785d96f8ab24c>:0
at Dummiesman.OBJLoader.Load (System.String path, System.String mtlPath) [0x00053] in <7a3b30ffd72c450c8a1785d96f8ab24c>:0
at Dummiesman.OBJLoader.Load (System.String path) [0x00000] in <7a3b30ffd72c450c8a1785d96f8ab24c>:0
at Collections.LoadMesh (System.String path) [0x00005] in <729fe5c313ad495ba5b9cf3dc42b4587>:0
at Collections.CreateBlock (System.String _collection, System.String _block, System.Boolean addComponent) [0x00028] in <729fe5c313ad495ba5b9cf3dc42b4587>:0
at Cache+<PrepareCache>d__7.MoveNext () [0x001ae] in <729fe5c313ad495ba5b9cf3dc42b4587>:0
at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00027] in <3b3eb4e308d8437b93d50c4c5ea504da>:0
(Filename: <3b3eb4e308d8437b93d50c4c5ea504da> Line: 0)
```
Is there anything I can do to help debug the issue?