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    java.lang.NullPointerException
        at net.floodlightcontroller.learningswitch.LearningSwitch.createMatchFromPacket(LearningSwitch.java:384)
        at net.floodlightcontroller.learningswitch.LearningSwitch.processPacketInMessage(LearningSwitch.java:413)
        at net.floodlightcontroller.learningswitch.LearningSwitch.receive(LearningSwitch.java:526)
        at net.floodlightcontroller.interceptor.Relay.sendToController(Relay.java:99)
    3 frames hidden