unable to assemble racingbikini_manual and shiika_1.10, avatartools says NRE

gistfile1.txt

NullReferenceException: Object reference not set to an instance of an object
KurotoriTools.KurotoriUtility.GetBonePath (UnityEngine.Transform rootBone, UnityEngine.Transform target) (at Assets/KurotoriTools/KurotoriUnityLib/Editor/KurotoriUtility.cs:166)
KurotoriTools.AvatarAssemblerCore.CopyMesh (UnityEngine.GameObject assembledObject, UnityEngine.GameObject parts, KurotoriTools.BonePathInfo assembledInfo, KurotoriTools.BonePathInfo partsInfo, System.Collections.Generic.List`1[UnityEngine.SkinnedMeshRenderer]& newAssembledMeshList) (at Assets/KurotoriTools/AvatarTools/Editor/AvatarAssemblerCore.cs:633)
KurotoriTools.AvatarAssemblerCore.CopyAvatarParts (UnityEngine.GameObject assembledAvatar) (at Assets/KurotoriTools/AvatarTools/Editor/AvatarAssemblerCore.cs:500)
KurotoriTools.AvatarAssemblerCore.CreateAssembledAvatar (System.String name) (at Assets/KurotoriTools/AvatarTools/Editor/AvatarAssemblerCore.cs:331)
KurotoriTools.AvatarAssemblerUI.Assemble () (at Assets/KurotoriTools/AvatarTools/Editor/UI/AvatarAssemblerUI.cs:46)
KurotoriTools.AvatarAssemblerUI.OnGUI () (at Assets/KurotoriTools/AvatarTools/Editor/UI/AvatarAssemblerUI.cs:89)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <eae584ce26bc40229c1b1aa476bfa589>:0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at <a259d3c004024353a2c217da97495055>:0)
UnityEditor.HostView.Invoke (System.String methodName) (at <a259d3c004024353a2c217da97495055>:0)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at <a259d3c004024353a2c217da97495055>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect) (at <a259d3c004024353a2c217da97495055>:0)
UnityEditor.DockArea.OldOnGUI () (at <a259d3c004024353a2c217da97495055>:0)
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 <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <b6a7e1825c0b45d3b0729282e86cc687>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <344226e341014466b33f0c0fa34fcef5>:0)