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Unable to start activity ComponentInfo{com.naran.whacko/com.naran.whacko.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setVisibility(int)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.naran.whacko/com.naran.whacko.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageButton.setVisibility(int)' on a null object reference
                                                                at    android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)