java.lang.IllegalArgumentException: Empty key

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java.lang.IllegalArgumentException: Empty key
at javax.crypto.spec.SecretKeySpec.(SecretKeySpec.java:94)
at org.openhab.binding.zwave.internal.protocol.commandclass.ZWaveSecurityCommandClass.setRealNetworkKey(ZWaveSecurityCommandClass.java:1012)
at org.openhab.binding.zwave.handler.ZWaveControllerHandler.initializeNetwork(ZWaveControllerHandler.java:109)
at org.openhab.binding.zwave.handler.ZWaveSerialHandler.initialize(ZWaveSerialHandler.java:96)
at org.eclipse.smarthome.core.thing.internal.ThingManager$7$1.call(ThingManager.java:644)
at org.eclipse.smarthome.core.thing.internal.ThingManager$7$1.call(ThingManager.java:1)
at org.eclipse.smarthome.core.common.SafeMethodCaller$CallableWrapper.call(SafeMethodCaller.java:170)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:744)

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