[BUG] "The VRCSDK build was aborted because the VRCSDKPreprocessAvatarCallback 'AvatarBuildHook' reported a failure."

[Rycia]

I came across this error when building for quest and for the life of me I can't figure out what it is.

System.IndexOutOfRangeException: Index was outside the bounds of the array.
  at d4rkAvatarOptimizer.FindAllPhysBoneDependencies () [0x0033f] in .\Packages\d4rkpl4y3r.d4rkavataroptimizer\Editor\d4rkAvatarOptimizer.cs:2251 
  at d4rkAvatarOptimizer.FindAllPhysBonesToDisable () [0x00010] in .\Packages\d4rkpl4y3r.d4rkavataroptimizer\Editor\d4rkAvatarOptimizer.cs:2308 
  at d4rkAvatarOptimizer.Optimize () [0x0014c] in .\Packages\d4rkpl4y3r.d4rkavataroptimizer\Editor\d4rkAvatarOptimizer.cs:155 
  at d4rkpl4y3r.AvatarOptimizer.AvatarBuildHook.OnPreprocessAvatar (UnityEngine.GameObject avatarGameObject) [0x00045] in .\Packages\d4rkpl4y3r.d4rkavataroptimizer\Editor\AvatarBuildHook.cs:37 
UnityEngine.Logger:Log (UnityEngine.LogType,object)
(wrapper dynamic-method) UnityEngine.Debug:UnityEngine.Debug.LogError_Patch1 (object)
d4rkpl4y3r.AvatarOptimizer.AvatarBuildHook:OnPreprocessAvatar (UnityEngine.GameObject) (at ./Packages/d4rkpl4y3r.d4rkavataroptimizer/Editor/AvatarBuildHook.cs:42)
VRC.SDKBase.Editor.BuildPipeline.VRCBuildPipelineCallbacks:OnPreprocessAvatar (UnityEngine.GameObject)
nadena.dev.ndmf.ApplyOnPlay:MaybeProcessAvatar (nadena.dev.ndmf.runtime.ApplyOnPlayGlobalActivator/OnDemandSource,UnityEngine.MonoBehaviour) (at ./Packages/nadena.dev.ndmf/Editor/ApplyOnPlay.cs:98)
nadena.dev.ndmf.runtime.AvatarActivator:Awake () (at ./Packages/nadena.dev.ndmf/Runtime/ApplyOnPlayGlobalActivator.cs:187)
UnityEngine.GameObject:AddComponent<nadena.dev.ndmf.runtime.AvatarActivator> ()
nadena.dev.ndmf.runtime.RuntimeUtil:GetOrAddComponent<nadena.dev.ndmf.runtime.AvatarActivator> (UnityEngine.GameObject) (at ./Packages/nadena.dev.ndmf/Runtime/RuntimeUtil.cs:33)
nadena.dev.ndmf.runtime.ApplyOnPlayGlobalActivator:Awake () (at ./Packages/nadena.dev.ndmf/Runtime/ApplyOnPlayGlobalActivator.cs:125)

The VRCSDK build was aborted because the VRCSDKPreprocessAvatarCallback 'AvatarBuildHook' reported a failure.
UnityEngine.Logger:Log (UnityEngine.LogType,object)
(wrapper dynamic-method) UnityEngine.Debug:UnityEngine.Debug.LogError_Patch1 (object)
VRC.SDKBase.Editor.BuildPipeline.VRCBuildPipelineCallbacks:OnPreprocessAvatar (UnityEngine.GameObject)
nadena.dev.ndmf.ApplyOnPlay:MaybeProcessAvatar (nadena.dev.ndmf.runtime.ApplyOnPlayGlobalActivator/OnDemandSource,UnityEngine.MonoBehaviour) (at ./Packages/nadena.dev.ndmf/Editor/ApplyOnPlay.cs:98)
nadena.dev.ndmf.runtime.AvatarActivator:Awake () (at ./Packages/nadena.dev.ndmf/Runtime/ApplyOnPlayGlobalActivator.cs:187)
UnityEngine.GameObject:AddComponent<nadena.dev.ndmf.runtime.AvatarActivator> ()
nadena.dev.ndmf.runtime.RuntimeUtil:GetOrAddComponent<nadena.dev.ndmf.runtime.AvatarActivator> (UnityEngine.GameObject) (at ./Packages/nadena.dev.ndmf/Runtime/RuntimeUtil.cs:33)
nadena.dev.ndmf.runtime.ApplyOnPlayGlobalActivator:Awake () (at ./Packages/nadena.dev.ndmf/Runtime/ApplyOnPlayGlobalActivator.cs:125)

Also getting this after saving the avatar prefab after trying to turn off delete unused objects (with no different of a result.)

Also confirmed my avatar works fine when I remove the d4rk optimizer component completely.
Also fails when the component is added with none of the options except apply on upload is on;

[d4rkc0d3r]

Uh oh. That error means you have a skinned mesh that does something really weird. It has at least one vertex that references a bone id that is larger than the list of bones in the skinned mesh renderer. That should not be a thing a mesh has.

Shouldn't be hard for me to log some warnings instead of producing an error though.

[Rycia]

If you could log which skinned mesh has the issue, that'd be super helpful too.

[d4rkc0d3r]

This should now be a warning instead of a crash in 3.9.1