Add nested Save Menu error message

Assets/Fungus/Scripts/Components/SaveMenu.cs

@@ -71,7 +71,14 @@ namespace Fungus
 
             instance = this;
 
+            if (transform.parent == null)
+            {
                 GameObject.DontDestroyOnLoad(this);
+            }
+            else
+            {
+                Debug.LogError("Save Menu cannot be preserved across scene loads if it is a child of another GameObject.");
+            }
 
             clickAudioSource = GetComponent<AudioSource>();
         }