anyone knows what is the meaning of this "love message"?

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java.net.SocketException: Broken pipe

at java.net.SocketOutputStream.socketWrite0(Native Method)

at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)

at java.net.SocketOutputStream.write(SocketOutputStream.java:124)

at processing.net.Client.write(Client.java:504)

at processing.net.Client.write(Client.java:530)

at processing.net.Server.write(Server.java:283)

at provaServer_send_2.keyPressed(provaServer_send_2.java:53)

at processing.core.PApplet.handleKeyEvent(PApplet.java:1973)

at processing.core.PApplet.dequeueKeyEvents(PApplet.java:1956)

at processing.core.PApplet.handleDraw(PApplet.java:1618)

at processing.core.PApplet.run(PApplet.java:1503)

at java.lang.Thread.run(Thread.java:637)

processing.app.debug.RunnerException: NullPointerException

at processing.app.Sketch.placeException(Sketch.java:1543)

at processing.app.debug.Runner.findException(Runner.java:583)

at processing.app.debug.Runner.reportException(Runner.java:558)

at processing.app.debug.Runner.exception(Runner.java:498)

at processing.app.debug.EventThread.exceptionEvent(EventThread.java:367)

at processing.app.debug.EventThread.handleEvent(EventThread.java:255)

at processing.app.debug.EventThread.run(EventThread.java:89)

Exception in thread "Animation Thread" java.lang.NullPointerException

at PLASTIC_POETRY_DA_11_prova_combinazione_.draw(PLASTIC_POETRY_DA_11_prova_combinazione_.java:100)

at processing.core.PApplet.handleDraw(PApplet.java:1606)

at processing.core.PApplet.run(PApplet.java:1503)

at java.lang.Thread.run(Thread.java:637)

I need to use two different computer, one controls a touch screen (using one application), the other controls a projector (connected to the other computer). 

I tryed to do a very stupid thing, just drag png images using mousePressed, but they blink all the time! why?