I have been having this problem all night where the validator on the SDK isnt functioning at all.

Errors listed below

Error 1

IndexOutOfRangeException: Index was outside the bounds of the array.

VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder.ValidateFeatures (VRC.SDKBase.VRC_AvatarDescriptor avatar, UnityEngine.Animator anim, VRC.SDKBase.Validation.Performance.Stats.AvatarPerformanceStats perfStats) (at ./Packages/com.vrchat.avatars/Editor/VRCSDK/SDK3A/VRCSdkControlPanelAvatarBuilder.cs:640)

VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder.OnGUIAvatarCheck (VRC.SDKBase.VRC_AvatarDescriptor avatar) (at ./Packages/com.vrchat.avatars/Editor/VRCSDK/SDK3A/VRCSdkControlPanelAvatarBuilder.cs:341)

VRC.SDK3A.Editor.VRCSdkControlPanelAvatarBuilder.ShowBuilder () (at ./Packages/com.vrchat.avatars/Editor/VRCSDK/SDK3A/VRCSdkControlPanelAvatarBuilder.cs:154)

VRCSdkControlPanel+<>c__DisplayClass184_0.<ShowBuilders>b__4 () (at ./Packages/com.vrchat.base/Editor/VRCSDK/Dependencies/VRChat/ControlPanel/VRCSdkControlPanelBuilder.cs:756)

UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

Error 2

System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.IMGUIContainer.DoIMGUIRepaint () (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.UIR.RenderChainCommand.ExecuteNonDrawMesh (UnityEngine.UIElements.UIR.DrawParams drawParams, System.Single pixelsPerPoint, System.Exception& immediateException) (at <332857d8803a4878904bcf8f9581ec33>:0)

Rethrow as ImmediateModeException

UnityEngine.UIElements.UIR.RenderChain.Render () (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.UIRRepaintUpdater.Update () (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.Panel.UpdateForRepaint () (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <332857d8803a4878904bcf8f9581ec33>:0)

UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <74d6aaa3aedf4a279751914e170fef65>:0)

I have tried to reimport the SDK on top and replace it multiple times I am unsure of the issue and yes I deleted the SDK from the project and then attempted to frankenstein another projects SDK to replace it and it worked with everything fine but did not fix the issue.