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An error occured while executing doInBackground()
java.lang.IllegalArgumentException: HTTP entity may not be null	at org.apache.http.util.EntityUtils.toString(EntityUtils.java:110)	at org.apache.http.util.EntityUtils.toString(EntityUtils.java:146)	at com.sistel.manantiales.SyncActivity$DatabaseSync.updateDatabase(SyncActivity.java:217)	at com.sistel.manantiales.SyncActivity$DatabaseSync.doInBackground(SyncActivity.java:165)	at com.sistel.manantiales.SyncActivity$DatabaseSync.doInBackground(SyncActivity.java:147)	at android.os.AsyncTask$2.call(AsyncTask.java:287)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)