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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)	at com.netflix.fenzo.AssignableVMs.createAvmIfAbsent(AssignableVMs.java:134)	at com.netflix.fenzo.AssignableVMs.setTaskAssigned(AssignableVMs.java:104)	at com.netflix.fenzo.TaskScheduler$2.call(TaskScheduler.java:808)	at com.netflix.fenzo.TaskScheduler$2.call(TaskScheduler.java:804)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93)	at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:28)	at cook.mesos.scheduler$reconcile_tasks.invokeStatic(scheduler.clj:789)	at cook.mesos.scheduler$reconcile_tasks.invoke(scheduler.clj:769)	at cook.mesos.scheduler$create_datomic_scheduler$fn__21044$fn__21045.invoke(scheduler.clj:1072)	at clojure.core$binding_conveyor_fn$fn__4676.invoke(core.clj:1938)	at clojure.lang.AFn.call(AFn.java:18)	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)