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An error occured while executing doInBackground()
java.lang.NullPointerException: Attempt to invoke virtual method 'void java.io.BufferedReader.close()' on a null object reference	at com.example.accurat.webservice.MainActivity$RestOperation.doInBackground(MainActivity.java:141)	at com.example.accurat.webservice.MainActivity$RestOperation.doInBackground(MainActivity.java:72)	at android.os.AsyncTask$2.call(AsyncTask.java:292)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:818)