Issue with controlP5 with oscP5

stefanolp

I'm trying to send a message (string) to a client after having pressed the button of a form.

String figure0;
void setup(){
cp5 = new ControlP5(this);  
cp5.addTextfield("input0").setPosition(x,y).setSize(125,20).setFocus(false).setColor(color(255,0,0)).setAutoClear(false);
cp5.addBang("Submit").setPosition(750, 100).setSize(80, 40); 
}
void Submit() {
  figure0 = cp5.get(Textfield.class,"input0").getText();  
  sendAnswer();
}
void sendAnswers(){
 OscMessage ansMessage = new OscMessage("/answer");
  ansMessage.add(figure0);
  oscP5agent1.send(ansMessage, myMaster); 
}

***the mymaster****
String prima;
void oscEvent2(OscMessage theOscMessage) {
  String w = theOscMessage.addrPattern();
  if (w.equals("/answer")) { 
    String prima=""+theOscMessage.arguments()[0];
      };   

This is the error message I have got. I tried to get through this problem but I can't understand the motivation. Advices? Thanks a lot!

    controlP5.ControlBroadcaster printMethodError
    GRAVE: An error occured while forwarding a Controller event, please check your code at Submit
    java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at controlP5.ControlBroadcaster.invokeMethod(Unknown Source)
        at controlP5.ControlBroadcaster.callTarget(Unknown Source)
        at controlP5.ControlBroadcaster.broadcast(Unknown Source)
        at controlP5.Controller.broadcast(Unknown Source)
        at controlP5.Bang.setValue(Unknown Source)
        at controlP5.Bang.update(Unknown Source)
        at controlP5.Bang.mousePressed(Unknown Source)
        at controlP5.Controller.setMousePressed(Unknown Source)
        at controlP5.ControllerGroup.setMousePressed(Unknown Source)
        at controlP5.ControlWindow.mousePressedEvent(Unknown Source)
        at controlP5.ControlWindow.mouseEvent(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at processing.core.PApplet$RegisteredMethods.handle(PApplet.java:848)
        at processing.core.PApplet.handleMouseEvent(PApplet.java:1794)
        at processing.core.PApplet.dequeueMouseEvents(PApplet.java:1748)
        at processing.core.PApplet.handleDraw(PApplet.java:1642)
        at processing.core.PApplet.run(PApplet.java:1530)
        at java.lang.Thread.run(Thread.java:680)
    Caused by: java.lang.NullPointerException
        at agent1.Submit(agent1.java:385)
        ... 24 more