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java.lang.NullPointerException: 	at org.odk.collect.android.utilities.WebUtils.getXmlDocument(WebUtils.java:327)	at org.odk.collect.android.tasks.DownloadFormListTask.doInBackground(DownloadFormListTask.java:82)	at org.odk.collect.android.tasks.DownloadFormListTask.doInBackground(DownloadFormListTask.java:1)	at android.os.AsyncTask$2.call(AsyncTask.java:185)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)	at java.lang.Thread.run(Thread.java:1027)