Viewing logs doesn't work right now -- I get

    13/07/01 12:31:40.966 WARN AbstractHttpConnection: /log/?appId=app-20130701122932-0000&executorId=0&logType=stdout
    java.lang.NullPointerException
    	at spark.deploy.worker.ui.WorkerWebUI.log(WorkerWebUI.scala:59)
    	at spark.deploy.worker.ui.WorkerWebUI$$anonfun$2.apply(WorkerWebUI.scala:37)
    	at spark.deploy.worker.ui.WorkerWebUI$$anonfun$2.apply(WorkerWebUI.scala:37)
    	at spark.ui.JettyUtils$$anon$1.handle(JettyUtils.scala:45)
    	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1040)
    	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:976)
    	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
    	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
    	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
    	at org.eclipse.jetty.server.Server.handle(Server.java:363)
    	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:483)
    	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:920)
    	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:982)
    	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
    	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
    	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
    	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)
    	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
    	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    	at java.lang.Thread.run(Thread.java:680)