Implement new method

src/main/java/net/citizensnpcs/Citizens.java

@@ -174,6 +174,11 @@ public class Citizens extends JavaPlugin implements CitizensPlugin {
         return selector;
     }
 
+    @Override
+    public ClassLoader getOwningClassLoader() {
+        return getClassLoader();
+    }
+
     @Override
     public File getScriptFolder() {
         return new File(getDataFolder(), "scripts");