error Python in hue 3.9

[#1]

Hi:

When i execute a hello world in python on Hue notebook i have this error

01:29:33.223 [ForkJoinPool-1-worker-2] ERROR c.c.hue.livy.server.SessionServlet$ - internal error
java.lang.NullPointerException: null
        at com.cloudera.hue.livy.spark.SparkSubmitProcessBuilder.com$cloudera$hue$livy$spark$SparkSubmitProcessBuilder$$fromPath(SparkSubmitProcessBuilder.scala:292) ~[livy-assembly.jar:na]
        at com.cloudera.hue.livy.spark.SparkSubmitProcessBuilder.start(SparkSubmitProcessBuilder.scala:270) ~[livy-assembly.jar:na]
        at com.cloudera.hue.livy.server.batch.BatchSessionProcess$.apply(BatchSessionProcess.scala:34) ~[livy-assembly.jar:na]
        at com.cloudera.hue.livy.server.batch.BatchSessionProcessFactory.create(BatchSessionProcessFactory.scala:29) ~[livy-assembly.jar:na]
        at com.cloudera.hue.livy.server.batch.BatchSessionFactory.create(BatchSessionFactory.scala:28) ~[livy-assembly.jar:na]
        at com.cloudera.hue.livy.server.batch.BatchSessionFactory.create(BatchSessionFactory.scala:26) ~[livy-assembly.jar:na]
        at com.cloudera.hue.livy.server.SessionManager.create(SessionManager.scala:52) ~[livy-assembly.jar:na]
        at com.cloudera.hue.livy.server.SessionServlet$$anonfun$17$$anon$2$$anonfun$18.apply(SessionServlet.scala:113) ~[livy-assembly.jar:na]
        at com.cloudera.hue.livy.server.SessionServlet$$anonfun$17$$anon$2$$anonfun$18.apply(SessionServlet.scala:112) ~[livy-assembly.jar:na]
        at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24) ~[livy-assembly.jar:na]
        at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24) ~[livy-assembly.jar:na]
        at scala.concurrent.forkjoin.ForkJoinTask$AdaptedRunnableAction.exec(ForkJoinTask.java:1417) ~[livy-assembly.jar:na]
        at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:262) ~[livy-assembly.jar:na]
        at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975) ~[livy-assembly.jar:na]
        at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1478) [livy-assembly.jar:na]
        at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104) [livy-assembly.jar:na]

any idea??

[#2 · Accepted solution]

@Roberto Sancho

Are you running HDP or CDH? What version? Which tutorials? Please provide links to tutorial. Check your libraries versions and alignment. Also, your script seems to pass a null value where a value is expected. Validate input.