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java.lang.NullPointerException: null	at net.pms.util.FileUtil.getExtension(FileUtil.java:161)	at net.pms.util.FileUtil.getUrlExtension(FileUtil.java:157)	at net.pms.dlna.PlaylistFolder.getPlaylist(PlaylistFolder.java:225)	at net.pms.dlna.RootFolder.addWebFolder(RootFolder.java:388)	at net.pms.dlna.RootFolder.loadWebConf(RootFolder.java:332)	at net.pms.dlna.RootFolder.discoverChildren(RootFolder.java:154)	at net.pms.configuration.RendererConfiguration.getRootFolder(RendererConfiguration.java:446)	at net.pms.PMS.getRootFolder(PMS.java:131)	at net.pms.PMS.init(PMS.java:728)	at net.pms.PMS.createInstance(PMS.java:1062)	at net.pms.PMS.main(PMS.java:1177)