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java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference	at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)	at org.json.JSONTokener.nextValue(JSONTokener.java:94)	at org.json.JSONObject.(JSONObject.java:156)	at org.json.JSONObject.(JSONObject.java:173)	at rp.com.theconverter.View.Activities.CurrencyConvertActivity$MyAsyncTask.doInBackground(CurrencyConvertActivity.java:181)	at rp.com.theconverter.View.Activities.CurrencyConvertActivity$MyAsyncTask.doInBackground(CurrencyConvertActivity.java:134)	at android.os.AsyncTask$2.call(AsyncTask.java:288)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)