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java.lang.NullPointerException: 	at org.apache.spark.deploy.rest.StandaloneSubmitRequestServlet.handleSubmit(StandaloneRestServer.scala:177)	at org.apache.spark.deploy.rest.SubmitRequestServlet.doPost(RestSubmissionServer.scala:258)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.Server.handle(Server.java:370)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)	at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)	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:745)