java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at processing.serial.Serial.write(Unknown Source)
at undefined.sketch_jan14a.draw(sketch_jan14a.java:52)
at processing.core.PApplet.handleDraw(Unknown Source)
at processing.core.PApplet.run(Unknown Source)
at java.lang.Thread.run(Thread.java:636)

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