Hi. I update my project to the Unity 2018.1.0f2. I got some warnings about obsolet API like EditorApplication.hierarchyWindowChanged in SpineEditorUtilities and the skeleton doesn't preview in the inspector. Also, when I created the AnimationReferenceAsset and opened it in the Inspector, I got error:
NullReferenceException: Object reference not set to an instance of an object
Spine.Unity.Editor.AnimationReferenceAssetEditor.OnInspectorGUI () (at Assets/Plugins/Spine/spine-unity/Editor/AnimationReferenceAssetEditor.cs:66)
UnityEditor.InspectorWindow.DrawEditor (UnityEditor.Editor[] editors, Int32 editorIndex, Boolean rebuildOptimizedGUIBlock, System.Boolean& showImportedObjectBarNext, UnityEngine.Rect& importedObjectBarRect) (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1295)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)