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java.lang.AssertionError: Can't unlock: Not locked! at water.Lockable$Unlock.atomic(Lockable.java:181) at water.Lockable$Unlock.atomic(Lockable.java:176) at water.TAtomic.atomic(TAtomic.java:17) at water.Atomic.compute2(Atomic.java:55) at water.Atomic.fork(Atomic.java:39) at water.Atomic.invoke(Atomic.java:31) at water.Lockable.unlock(Lockable.java:171) at hex.tree.SharedTree$Driver.compute2(SharedTree.java:232) at water.H2O$H2OCountedCompleter.compute(H2O.java:1005) at jsr166y.CountedCompleter.exec(CountedCompleter.java:429) at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263) at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974) at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477) at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)