java.util.concurrent.ExecutionException: java.lang.NullPointerException

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java.lang.NullPointerException
java.util.concurrent.ExecutionException: java.lang.NullPointerException
at org.openhab.binding.netatmo.handler.AbstractNetatmoThingHandler.(AbstractNetatmoThingHandler.java:55)
at org.openhab.binding.netatmo.handler.NetatmoModuleHandler.(NetatmoModuleHandler.java:38)
at org.openhab.binding.netatmo.handler.thermostat.NATherm1Handler.(NATherm1Handler.java:42)
at org.openhab.binding.netatmo.internal.NetatmoHandlerFactory.createHandler(NetatmoHandlerFactory.java:60)
at org.eclipse.smarthome.core.thing.binding.BaseThingHandlerFactory.registerHandler(BaseThingHandlerFactory.java:133)
at org.eclipse.smarthome.core.thing.internal.ThingManager$7.call(ThingManager.java:628)
at org.eclipse.smarthome.core.thing.internal.ThingManager$7.call(ThingManager.java:1)
at org.eclipse.smarthome.core.common.SafeMethodCaller$CallableWrapper.call(SafeMethodCaller.java:177)
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:745)

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