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java.lang.NullPointerException: 	at net.sourceforge.subsonic.service.MediaFileService.getDescendantsOf(MediaFileService.java:652)	at net.sourceforge.subsonic.ajax.PlayQueueService.doAdd(PlayQueueService.java:479)	at net.sourceforge.subsonic.ajax.PlayQueueService.doSet(PlayQueueService.java:500)	at net.sourceforge.subsonic.controller.RESTController.jukeboxControl(RESTController.java:971)	at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:473)	at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:410)	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)	at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)	at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:132)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)	at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.wrapper.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:81)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at net.sourceforge.subsonic.security.RESTRequestParameterProcessingFilter.doFilter(RESTRequestParameterProcessingFilter.java:113)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.ui.logout.LogoutFilter.doFilter(LogoutFilter.java:110)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149)	at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at net.sourceforge.subsonic.filter.RequestEncodingFilter.doFilter(RequestEncodingFilter.java:43)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at net.sourceforge.subsonic.filter.RESTFilter.doFilter(RESTFilter.java:60)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at net.sourceforge.subsonic.filter.ParameterDecodingFilter.doFilter(ParameterDecodingFilter.java:54)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at net.sourceforge.subsonic.filter.BootstrapVerificationFilter.doFilter(BootstrapVerificationFilter.java:59)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)	at org.mortbay.jetty.Server.handle(Server.java:313)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)