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java.lang.NullPointerException: 	at java.io.File.fixSlashes(File.java:185)	at java.io.File.(File.java:134)	at org.odk.collect.android.utilities.FileUtils.purgeMediaPath(FileUtils.java:407)	at org.odk.collect.android.tasks.DownloadFormsTask.cleanUp(DownloadFormsTask.java:202)	at org.odk.collect.android.tasks.DownloadFormsTask.doInBackground(DownloadFormsTask.java:165)	at org.odk.collect.android.tasks.DownloadFormsTask.doInBackground(DownloadFormsTask.java:1)	at android.os.AsyncTask$2.call(AsyncTask.java:288)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:841)