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java.lang.NullPointerException: Attempt to invoke virtual method 'int org.json.JSONArray.length()' on a null object reference	at com.example.ashis.booklisting.QueryUtils.extractFromJson(QueryUtils.java:69)	at com.example.ashis.booklisting.QueryUtils.fetchBookData(QueryUtils.java:38)	at com.example.ashis.booklisting.MainActivity$BookAsyncTask.doInBackground(MainActivity.java:58)	at com.example.ashis.booklisting.MainActivity$BookAsyncTask.doInBackground(MainActivity.java:51)	at android.os.AsyncTask$2.call(AsyncTask.java:295)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)	at java.lang.Thread.run(Thread.java:818)