Livy.sql interpreter fails to execute

java.lang.RuntimeException: Fail to callRemoteFunction, because connection is broken
	at org.apache.zeppelin.interpreter.remote.PooledRemoteClient.callRemoteFunction(PooledRemoteClient.java:108)
	at org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess.callRemoteFunction(RemoteInterpreterProcess.java:98)
	at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.interpret(RemoteInterpreter.java:208)
	at org.apache.zeppelin.notebook.Paragraph.jobRun(Paragraph.java:490)
	at org.apache.zeppelin.notebook.Paragraph.jobRun(Paragraph.java:72)
	at org.apache.zeppelin.scheduler.Job.run(Job.java:172)
	at org.apache.zeppelin.scheduler.AbstractScheduler.runJob(AbstractScheduler.java:132)
	at org.apache.zeppelin.scheduler.RemoteScheduler$JobRunner.run(RemoteScheduler.java:182)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)