Update

Assets/Third Parties/Opsive/UltimateCharacterController/Scripts/StateSystem/StateInspectorHelper.cs

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+/// ---------------------------------------------
+/// Ultimate Character Controller
+/// Copyright (c) Opsive. All Rights Reserved.
+/// https://www.opsive.com
+/// ---------------------------------------------
+
+#if UNITY_EDITOR
+namespace Opsive.UltimateCharacterController.StateSystem
+{
+    using UnityEngine;
+
+    /// <summary>
+    /// Inspector helper class for the UltimateCharacterControllerInspector to be able to display states within the ReorderableList.
+    /// </summary>
+    public class StateInspectorHelper : MonoBehaviour
+    {
+        [SerializeField] private int[] m_StateIndexData;
+        public int[] StateIndexData { get { return m_StateIndexData; } set { m_StateIndexData = value; } }
+    }
+}
+#endif