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java.lang.NullPointerException: 	at org.openstack4j.openstack.internal.BaseOpenStackService.builder(BaseOpenStackService.java:84)	at org.openstack4j.openstack.internal.BaseOpenStackService.builder(BaseOpenStackService.java:79)	at org.openstack4j.openstack.internal.BaseOpenStackService.get(BaseOpenStackService.java:46)	at org.openstack4j.openstack.compute.internal.ServerServiceImpl.list(ServerServiceImpl.java:86)	at org.openstack4j.openstack.compute.internal.ServerServiceImpl.list(ServerServiceImpl.java:74)	at org.openstack4j.openstack.compute.internal.ServerServiceImpl.list(ServerServiceImpl.java:66)	at de.uks.openstack.dnsaas.InstanceTask.run(InstanceTask.java:29)	at java.util.TimerThread.mainLoop(Timer.java:555)	at java.util.TimerThread.run(Timer.java:505)