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java.lang.IllegalArgumentException: Empty key	at javax.crypto.spec.SecretKeySpec.(	at org.openhab.binding.zwave.internal.protocol.commandclass.ZWaveSecurityCommandClass.setRealNetworkKey(	at org.openhab.binding.zwave.handler.ZWaveControllerHandler.initializeNetwork(	at org.openhab.binding.zwave.handler.ZWaveSerialHandler.initialize(	at org.eclipse.smarthome.core.thing.internal.ThingManager$7$	at org.eclipse.smarthome.core.thing.internal.ThingManager$7$	at org.eclipse.smarthome.core.common.SafeMethodCaller$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at