Zeppeling throwing NullPointerException while configuring - scala

Question

I am trying to set up zeppelin-0.8.0 on my windos 8 r2 OS. I have already running spark on my console i.e. SPARK_HOME and JAVA_HOME, HADOOP_HOME set up and running fine. But while I am trying to execute printl("hello") in zeppelin spark interpreter it is throwing bellow error ...
I already set SPARK_HOME and JAVA_HOME in zeppelin-env.cmd file.
Error
DEBUG [2019-01-22 10:05:34,129] ({pool-2-thread-2} RemoteInterpreterManagedProcess.java[start]:153) - callbackServer is serving now
INFO [2019-01-22 10:05:34,143] ({pool-2-thread-2} RemoteInterpreterManagedProcess.java[start]:190) - Run interpreter process [C:\Software\Zepplin\zepplin\bin\interpreter.cmd, -d, C:\Software\Zepplin\zepplin/interpreter/spark, -c, 10.188.16
DEBUG [2019-01-22 10:05:34,419] ({Exec Stream Pumper} RemoteInterpreterManagedProcess.java[processLine]:298) - When was unexpected at this time.
INFO [2019-01-22 10:05:34,435] ({Exec Default Executor} RemoteInterpreterManagedProcess.java[onProcessFailed]:250) - Interpreter process failed {}
org.apache.commons.exec.ExecuteException: Process exited with an error: 255 (Exit value: 255)
at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:404)
at org.apache.commons.exec.DefaultExecutor.access$200(DefaultExecutor.java:48)
at org.apache.commons.exec.DefaultExecutor$1.run(DefaultExecutor.java:200)
at java.lang.Thread.run(Thread.java:748)
ERROR [2019-01-22 10:06:34,177] ({pool-2-thread-2} Job.java[run]:190) - Job failed
java.lang.RuntimeException: When was unexpected at this time.
at org.apache.zeppelin.interpreter.remote.RemoteInterpreterManagedProcess.start(RemoteInterpreterManagedProcess.java:205)
at org.apache.zeppelin.interpreter.ManagedInterpreterGroup.getOrCreateInterpreterProcess(ManagedInterpreterGroup.java:64)
at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.getOrCreateInterpreterProcess(RemoteInterpreter.java:111)
at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.internal_create(RemoteInterpreter.java:164)
at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.open(RemoteInterpreter.java:132)
at org.apache.zeppelin.interpreter.remote.RemoteInterpreter.getFormType(RemoteInterpreter.java:299)
at org.apache.zeppelin.notebook.Paragraph.jobRun(Paragraph.java:407)
at org.apache.zeppelin.scheduler.Job.run(Job.java:188)
at org.apache.zeppelin.scheduler.RemoteScheduler$JobRunner.run(RemoteScheduler.java:307)
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)
ERROR [2019-01-22 10:06:52,103] ({pool-2-thread-2} NotebookServer.java[afterStatusChange]:2294) - Error
java.lang.RuntimeException: When was unexpected at this time.
at org.apache.zeppelin.interpreter.remote.RemoteInterpreterManagedProcess.start(RemoteInterpreterManagedProcess.java:205)
at org.apache.zeppelin.interpreter.ManagedInterpreterGroup.getOrCreateInterpreterProcess(ManagedInterpreterGroup.java:64)