java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at edu.washington.escience.myria.operator.LeapFrogJoin.generateSchema(LeapFrogJoin.java:625)
at edu.washington.escience.myria.operator.Operator.getSchema(Operator.java:497)
at edu.washington.escience.myria.operator.RootOperator.generateSchema(RootOperator.java:158)
at edu.washington.escience.myria.operator.Operator.getSchema(Operator.java:497)
at edu.washington.escience.myria.api.encoding.QueryConstruct.setConsumerSchema(QueryConstruct.java:604)
at edu.washington.escience.myria.api.encoding.QueryConstruct.instantiate(QueryConstruct.java:95)
at edu.washington.escience.myria.parallel.JsonSubQuery.instantiate(JsonSubQuery.java:70)
at edu.washington.escience.myria.parallel.Query.nextSubQuery(Query.java:208)
at edu.washington.escience.myria.parallel.QueryManager.advanceQuery(QueryManager.java:336)
at edu.washington.escience.myria.parallel.QueryManager.submitQuery(QueryManager.java:262)
at edu.washington.escience.myria.parallel.QueryManager.submitQuery(QueryManager.java:513)
at edu.washington.escience.myria.api.QueryResource.postNewQuery(QueryResource.java:92)
at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:151)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:172)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:152)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:104)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:384)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:342)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:254)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
at java.lang.Thread.run(Thread.java:745)

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