Fix InviteCommand

src/de/steamwar/misslewars/commands/InviteCommand.java

@@ -63,7 +63,7 @@ public class InviteCommand extends SWCommand {
 
     @ClassMapper(value = Player.class, local = true)
     public TypeMapper<Player> typeMapper() {
-        return new TypeMapper<Player>() {
+        return new TypeMapper<>() {
             @Override
             public Player map(CommandSender commandSender, String[] previousArguments, String s) {
                 return Bukkit.getPlayer(s);
@@ -84,11 +84,16 @@ public class InviteCommand extends SWCommand {
     @ClassValidator(value = Player.class, local = true)
     public TypeValidator<Player> validator() {
         return (commandSender, player, messageSender) -> {
-            if (Config.isChallenge()) {
+            if (!Config.isChallenge()) {
-                player.sendMessage("§cDieser Command ist deaktiviert.");
+                messageSender.send("§cDieser Command ist deaktiviert.");
                 return false;
             }
             return true;
         };
     }
+
+    @Override
+    protected void sendMessage(CommandSender sender, String message, Object[] args) {
+        sender.sendMessage(message);
+    }
 }