Error when trying to build avatar

Help!
1

Whenever I try to build I get this error:

Avatar validation failed
UnityEngine.Logger:Log (UnityEngine.LogType,object,UnityEngine.Object)
(wrapper dynamic-method) UnityEngine.Debug:UnityEngine.Debug.LogError_Patch1 (object,UnityEngine.Object)
VRC.Core.Logger:LogError (string,string,UnityEngine.Object)
VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder/d__152:MoveNext () (at ./Packages/com.vrchat.avatars/Editor/VRCSDK/SDK3A/VRCSdkControlPanelAvatarBuilder.cs:3309)
System.Runtime.CompilerServices.AsyncVoidMethodBuilder:Start<VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder/d__152> (VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder/d__152&)
VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder:BuildError (object,string)
VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder/d__143:MoveNext () (at ./Packages/com.vrchat.avatars/Editor/VRCSDK/SDK3A/VRCSdkControlPanelAvatarBuilder.cs:2989)
System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<System.Exception>:Start<VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder/d__143> (VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder/d__143&)
VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder:HandleBuildError (System.Exception)
VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder/d__141:MoveNext () (at ./Packages/com.vrchat.avatars/Editor/VRCSDK/SDK3A/VRCSdkControlPanelAvatarBuilder.cs:2874)
UnityEngine.UnitySynchronizationContext:ExecuteTasks ()

PLEASE HELP!!!

2

Check any message in the log earlier than this one. Warnings, info, error, spam offers (joke)

Something will be in there.

Maybe you’re using a shader on a quest avatar that’s not supported?

3

Screenshot 2026-06-30 111643
Screenshot 2026-06-30 1116431920×1020 182 KB

Screenshot 2026-06-30 111638
Screenshot 2026-06-30 1116381920×1020 173 KB

this is all that appears :/
And I am using all mobile shaders

4

NEVERMIND! I got it working!!! I didn’t specify the face mesh for visemes!!

5

For future reference, this is an error alert in the VRChat SDK Builder that’s hard to miss.

image
image538×389 19.4 KB

6

Tangential off-topic mention: The original avatar Curse Sonic Plush （Iamjaystation） (avtr_7a394967-36f9-4654-8d79-0260e3ac728d) was made by Goodumb, ripped from VRChat and shared by someone, and this ripped copy ended up in OP’s hands somehow (prefab-id-v1_avtr_7a394967-36f9-4654-8d79-0260e3ac728d).