java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bignerdranch.android.contactapp/com.bignerdranch.android.contactapp.secondActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference

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Unable to start activity ComponentInfo{com.bignerdranch.android.contactapp/com.bignerdranch.android.contactapp.secondActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
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Unable to start activity ComponentInfo{itp231.dba.sit.nyp.com.tab_2/itp231.dba.sit.nyp.com.tab_2.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bignerdranch.android.contactapp/com.bignerdranch.android.contactapp.secondActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
at com.bignerdranch.android.contactapp.secondActivity.onCreate(secondActivity.java:37)
at android.app.Activity.performCreate(Activity.java:6057)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2331)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2440)
at android.app.ActivityThread.access$800(ActivityThread.java:162)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1348)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5422)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:914)

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