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java.lang.NullPointerException: 	at org.broad.igv.DirectoryManager.getIgvDirectory(	at org.broad.igv.DirectoryManager.getPreferencesFile(	at org.broad.igv.IGVPreferences.loadUserPreferences(	at org.broad.igv.IGVPreferences.get(	at org.broad.igv.IGVPreferences.get(	at org.broad.igv.PreferenceManager.get(	at org.broad.igv.PreferenceManager.get(	at	at	at org.broad.igv.util.HttpUtils.openConnection(	at org.broad.igv.util.HttpUtils.openConnection(	at org.broad.igv.util.HttpUtils.openConnectionHeadOrGet(	at org.broad.igv.util.HttpUtils.getHeaderField(	at org.broad.igv.util.HttpUtils.getContentLength(	at org.broad.igv.util.HttpUtils.useByteRange(	at	at	at	at	at