Learning kyro and java for school some problems..

Im trying to make basic server whit kyro. Getting this weird error.

```
Exception in thread "main" java.lang.NoClassDefFoundError: org/objenesis/instantiator/ObjectInstantiator
at com.esotericsoftware.kryonet.KryoSerialization.(KryoSerialization.java:25)
at com.esotericsoftware.kryonet.Server.(Server.java:91)
at com.esotericsoftware.kryonet.Server.(Server.java:73)
at server.GameServer.(GameServer.java:24)
at server.GameServer.main(GameServer.java:54)
Caused by: java.lang.ClassNotFoundException: org.objenesis.instantiator.ObjectInstantiator
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 5 more
```

quicktestcode.

```
package server;

import java.io.IOException;

import com.badlogic.gdx.ApplicationAdapter;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryonet.Connection;
import com.esotericsoftware.kryonet.Listener;
import com.esotericsoftware.kryonet.Server;
import server.SomeRequest;
import common.Network;

public class GameServer extends ApplicationAdapter {

static int SERVER_TCP_PORT;
static int SERVER_UDP_PORT;

public GameServer () throws IOException {

Server server = new Server();

Kryo kryo = server.getKryo();
kryo.register(SomeRequest.class);
kryo.register(SomeResponse.class);

server.start();
server.bind(3000, 3001);

server.addListener(new Listener() {
public void received (Connection connection, Object object) {
if (object instanceof SomeRequest) {
SomeRequest request = (SomeRequest)object;
System.out.println(request.text);

SomeResponse response = new SomeResponse();
response.text = "Thanks";
connection.sendTCP(response);
}
}
});
}

public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
//SERVER_TCP_PORT = Network.SERVER_TCP_PORT;
//SERVER_UDP_PORT = Network.SERVER_UDP_PORT;

new GameServer();

}
}

```