Hotfix couldnt save chunk

SpigotCore_Main/src/de/steamwar/sql/SWException.java

@@ -67,6 +67,7 @@ public class SWException {
         reasons.add("Chunk file at [");
         reasons.add("Ignoring unknown attribute");
         reasons.add("Skipping player strafe phase because no player was found");
+        reasons.add("Couldn't save chunk; already in use by another instance of Minecraft?");
         ignorereasons = Collections.unmodifiableList(reasons);
     }