Probleme mit Processing

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MHh wenn ich das mache, dann erzeugt er einen Fehler wenn ich in den Comport schreiben möchte:

Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7
java.lang.NullPointerException
	at processing.serial.Serial.write(Unknown Source)
	at Simula.draw(Simula.java:51)
	at processing.core.PApplet.handleDraw(PApplet.java:2142)
	at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:193)
	at processing.core.PApplet.run(PApplet.java:2020)
	at java.lang.Thread.run(Thread.java:662)
Exception in thread "Animation Thread" java.lang.RuntimeException: Error inside Serial.write()
	at processing.serial.Serial.errorMessage(Unknown Source)
	at processing.serial.Serial.write(Unknown Source)
	at Simula.draw(Simula.java:51)
	at processing.core.PApplet.handleDraw(PApplet.java:2142)
	at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:193)
	at processing.core.PApplet.run(PApplet.java:2020)
	at java.lang.Thread.run(Thread.java:662)