java.lang.NullPointerException: This exception has no message.

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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)

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