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java.lang.NullPointerException: 	at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1057)	at android.support.v4.app.FragmentManagerImpl.removeFragment(FragmentManager.java:1235)	at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:697)	at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)	at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:458)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at org.robolectric.shadows.ShadowMessageQueue.dispatchMessage(ShadowMessageQueue.java:130)	at org.robolectric.shadows.ShadowMessageQueue.access$100(ShadowMessageQueue.java:30)	at org.robolectric.shadows.ShadowMessageQueue$1.run(ShadowMessageQueue.java:95)	at org.robolectric.util.Scheduler$ScheduledRunnable.run(Scheduler.java:269)	at org.robolectric.util.Scheduler.runOneTask(Scheduler.java:179)	at org.robolectric.util.Scheduler.advanceTo(Scheduler.java:160)	at org.robolectric.util.Scheduler.advanceBy(Scheduler.java:143)	at org.robolectric.util.Scheduler.runOrQueueRunnable(Scheduler.java:243)	at org.robolectric.util.Scheduler.postDelayed(Scheduler.java:85)	at org.robolectric.shadows.ShadowMessageQueue.enqueueMessage(ShadowMessageQueue.java:116)	at android.os.MessageQueue.enqueueMessage(MessageQueue.java)	at android.os.Handler.enqueueMessage(Handler.java:631)	at android.os.Handler.sendMessageAtTime(Handler.java:600)	at android.os.Handler.sendMessageDelayed(Handler.java:570)	at android.os.Handler.sendMessage(Handler.java:507)	at android.os.Message.sendToTarget(Message.java:416)	at com.android.internal.app.AlertController$1.onClick(AlertController.java:134)	at android.view.View.performClick(View.java:4756)	at org.robolectric.shadows.ShadowView.checkedPerformClick(ShadowView.java:346)	at org.robolectric.shadows.ShadowView.clickOn(ShadowView.java:70)	at com.humana.vitalityapp.integration.ChallengesIntegrationTest.whenAUserIsOnTheChallengeList_andIsEnrolledInAChallengeThatIsInEnrollingPhase_userCanLeaveTeam(ChallengesIntegrationTest.java:412)	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)	at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:251)	at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:188)	at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:54)	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)	at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:152)