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java.lang.NullPointerException
java.lang.NullPointerException: 	at org.matmaul.freeboxos.login.LoginManager.hmacSha1(LoginManager.java:114)	at org.matmaul.freeboxos.login.LoginManager.openSession(LoginManager.java:96)	at org.matmaul.freeboxos.internal.RestManager.execute(RestManager.java:168)	at org.matmaul.freeboxos.internal.RestManager.get(RestManager.java:112)	at org.matmaul.freeboxos.internal.RestManager.get(RestManager.java:107)	at org.matmaul.freeboxos.call.CallManager.getCallEntries(CallManager.java:17)	at org.openhab.binding.freebox.handler.FreeboxThingHandler.fetchNewCalls(FreeboxThingHandler.java:229)	at org.openhab.binding.freebox.handler.FreeboxThingHandler.access$4(FreeboxThingHandler.java:228)	at org.openhab.binding.freebox.handler.FreeboxThingHandler$2.run(FreeboxThingHandler.java:178)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)	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)