how to create 2d bone sprite in runtime mode

In 2d Animation package I saw the SpriteSkinEdiotr can use the CreateBoneHierarchy method


private void DoGenerateBonesButton()
{
if (GUILayout.Button("Create Bones", GUILayout.MaxWidth(125f)))
{
foreach (var t in targets)
{
var spriteSkin = t as SpriteSkin;
var sprite = spriteSkin.spriteRenderer.sprite;
if (sprite == null || spriteSkin.rootBone != null)
continue;
Undo.RegisterCompleteObjectUndo(spriteSkin, "Create Bones");
Debug.Log("#######"+ spriteSkin);
spriteSkin.CreateBoneHierarchy();
foreach (var transform in spriteSkin.boneTransforms)
Undo.RegisterCreatedObjectUndo(transform.gameObject, "Create Bones");
ResetBoundsIfNeeded(spriteSkin);
EditorUtility.SetDirty(spriteSkin);
}
BoneGizmo.instance.boneGizmoController.OnSelectionChanged();
}
}


but i Can't use this method in my script? why