java.lang.NullPointerException

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  • java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference at info.androidhive.customlistviewvolley.MainActivity.onCreate(MainActivity.java:55) at android.app.Activity.performCreate(Activity.java:6185)
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