java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nurfacegames.testgame07/com.nurfacegames.testgame07.TestGame07}: java.lang.NullPointerException

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java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nurfacegames.testgame07/com.nurfacegames.testgame07.TestGame07}: java.lang.NullPointerException
at com.nurfacegames.testgame07.MainMenuFragment.updateUi(MainMenuFragment.java:61)
at com.nurfacegames.testgame07.MainMenuFragment.onStart(MainMenuFragment.java:48)
at android.support.v4.app.Fragment.performStart(Fragment.java:1484)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:941)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1070)
at android.support.v4.app.FragmentManagerImpl.dispatchStart(FragmentManager.java:1866)
at com.google.example.games.basegameutils.BaseGameActivity.onStart(BaseGameActivity.java:110)
at com.nurfacegames.testgame07.TestGame07.onStart(TestGame07.java:522)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1129)
at android.app.Activity.performStart(Activity.java:3871)

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