ERROR util.Utils: Uncaught exception in thread shutdown-hook-0

[yhs1450239423]

INFO PRoST: LOADER TERMINATED SUCCESSFULLY
22/06/30 16:37:06 INFO spark.SparkContext: Invoking stop() from shutdown hook
22/06/30 16:37:06 ERROR util.Utils: Uncaught exception in thread shutdown-hook-0
java.lang.NullPointerException
at org.apache.spark.util.logging.DriverLogger$$anonfun$stop$1.apply$mcV$sp(DriverLogger.scala:80)
at org.apache.spark.util.Utils$.tryLogNonFatalError(Utils.scala:1343)
at org.apache.spark.util.logging.DriverLogger.stop(DriverLogger.scala:80)
at org.apache.spark.SparkContext$$anonfun$stop$2$$anonfun$apply$mcV$sp$3.apply(SparkContext.scala:1945)
at org.apache.spark.SparkContext$$anonfun$stop$2$$anonfun$apply$mcV$sp$3.apply(SparkContext.scala:1945)
at scala.Option.foreach(Option.scala:257)
at org.apache.spark.SparkContext$$anonfun$stop$2.apply$mcV$sp(SparkContext.scala:1945)
at org.apache.spark.util.Utils$.tryLogNonFatalError(Utils.scala:1343)
at org.apache.spark.SparkContext.stop(SparkContext.scala:1944)
at org.apache.spark.SparkContext$$anonfun$3.apply$mcV$sp(SparkContext.scala:586)
at org.apache.spark.util.SparkShutdownHook.run(ShutdownHookManager.scala:216)
at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(ShutdownHookManager.scala:188)
at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1$$anonfun$apply$mcV$sp$1.apply(ShutdownHookManager.scala:188)
at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1$$anonfun$apply$mcV$sp$1.apply(ShutdownHookManager.scala:188)
at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1948)
at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1.apply$mcV$sp(ShutdownHookManager.scala:188)
at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1.apply(ShutdownHookManager.scala:188)
at org.apache.spark.util.SparkShutdownHookManager$$anonfun$runAll$1.apply(ShutdownHookManager.scala:188)
at scala.util.Try$.apply(Try.scala:192)
at org.apache.spark.util.SparkShutdownHookManager.runAll(ShutdownHookManager.scala:188)
at org.apache.spark.util.SparkShutdownHookManager$$anon$2.run(ShutdownHookManager.scala:178)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
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)
22/06/30 16:37:06 INFO server.AbstractConnector: Stopped Spark@20765ed5{HTTP/1.1,[http/1.1]}{0.0.0.0:4040}

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when I run the prost-load, The program has finished running the main function, he outputs "LOADER TERMINATED SUCCESSFULLY", but the program still reports a error：“ERROR util.Utils: Uncaught exception in thread shutdown-hook-0”, how I can deal with the error.