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Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference	at com.example.rubit1359.bigcornbox.ui.MainActivity$1.onResponse(MainActivity.java:57)	at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68)	at android.os.Handler.handleCallback(Handler.java:815)	at android.os.Handler.dispatchMessage(Handler.java:104)	at android.os.Looper.loop(Looper.java:194)	at android.app.ActivityThread.main(ActivityThread.java:5637)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)