java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mynotescode.apps.layout/com.mynotescode.apps.layout.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference

      at com.mynotescode.apps.layout.MainActivity.onCreate()
    2. com.mynotescode.apps
      MainActivity.onCreate
      1. com.mynotescode.apps.layout.MainActivity.onCreate(MainActivity.java:18)
      1 frame
    3. Android Platform
      ActivityThread.performLaunchActivity
      1. android.app.Activity.performCreate(Activity.java:5975)
      2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
      3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
      3 frames