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java.lang.NullPointerException: 	at abs.backend.java.lib.runtime.ABSFutureGuard.isTrue(ABSFutureGuard.java:21)	at abs.backend.java.lib.runtime.ABSRuntime.await(ABSRuntime.java:344)	at NullFut.C_c.start(C_c.java:77)	at NullFut.Main$1.execute(Main.java:34)	at abs.backend.java.lib.runtime.Task.run(Task.java:190)	at abs.backend.java.scheduling.DefaultTaskScheduler$SchedulerThread.run(DefaultTaskScheduler.java:82)