Fitnesse test page throwing an exception

Question

I'm running Fitnesse testing tool via Jenkins. Jenkins runs fitnesse after fixed interval. Following is the test page:-Fitnesse Test Page

1.creating script file 2. running it

In this, I'm simply printing message but this test page sometimes thrown an exception:-

java.util.NoSuchElementException
    at java.util.LinkedList.removeFirst(LinkedList.java:270)
    at com.objectmentor.fixtures.LineGatherer.readLine(LineGatherer.java:42)
    at com.objectmentor.fixtures.CommandLineFixture.flush(CommandLineFixture.java:291)
    at com.objectmentor.fixtures.CommandLineFixture.flushProcess(CommandLineFixture.java:65)
    at com.objectmentor.fixtures.CommandLineFixture.endTable(CommandLineFixture.java:59)
    at com.objectmentor.fixtures.CommandLineFixture.doTable(CommandLineFixture.java:48)
    at fit.Fixture.interpretFollowingTables(Fixture.java:121)
    at fit.Fixture.interpretTables(Fixture.java:107)
    at fit.Fixture.doTables(Fixture.java:81)
    at fit.FitServer.process(FitServer.java:81)
    at fit.FitServer.run(FitServer.java:56)
    at fit.FitServer.main(FitServer.java:41)

Exception

This exception thrown sometimes and sometimes it work perfectly. It fail 2 out of 10 times . and I didn't change anything , i am simply running same test after every 30 min.