Hello, I want to understand the protocol osc, got an exemple on the site of oscp5(http://www.sojamo.de/libraries/oscP5/examples/oscP5message/oscP5message.pde) to apply on a small example(Rotation of a cube), I have done two separate file a client and a server program but when
I run the two programs it gives me the following error:
NullPointerException
Exception in thread "Animation Thread" java.lang.NullPointerException

at client.mousePressed(client.java:50)

at processing.core.PApplet.handleMouseEvent(PApplet.java:1585)

at processing.core.PApplet.dequeueMouseEvents(PApplet.java:1522)

at processing.core.PApplet.handleDraw(PApplet.java:1417)

at processing.core.PApplet.run(PApplet.java:1311)

at java.lang.Thread.run(Unknown Source)

Here is the code of client and server:
Client code:

import oscP5.*;
import netP5.*;

OscP5 oscP5;
NetAddress myRemoteLocation;

void setup() {
 size(400,400);
 frameRate(25);
 
 myRemoteLocation = new NetAddress("127.0.0.1",12000);
}


void draw() {
 background(0);  
}

void mousePressed() {
 /* in the following different ways of creating osc messages are shown by example */
 OscMessage myMessage = new OscMessage("/test");
 
 myMessage.add(123); /* add an int to the osc message */
 myMessage.add(12.34); /* add a float to the osc message */
 myMessage.add("some text"); /* add a string to the osc message */
 myMessage.add(new byte[] {0x00, 0x01, 0x10, 0x20}); /* add a byte blob to the osc message */
 myMessage.add(new int[] {1,2,3,4}); /* add an int array to the osc message */

 /* send the message */
 oscP5.send(myMessage, myRemoteLocation);
}

Server code:

import oscP5.*;
import netP5.*;

OscP5 oscP5;
NetAddress myRemoteLocation;

void setup() {
 size(400,400);
 frameRate(25);
 
 oscP5 = new OscP5(this,12000);
 

}
void draw()
{

 background(0);
 
}



/* incoming osc message are forwarded to the oscEvent method. */
void oscEvent(OscMessage theOscMessage) {
 /* print the address pattern and the typetag of the received OscMessage */
 print("### received an osc message.");
 print(" addrpattern: "+theOscMessage.addrPattern());
 println(" typetag: "+theOscMessage.typetag());
}