java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException	at org.apache.spark.storage.BlockManagerMasterEndpoint.org$apache$spark$storage$BlockManagerMasterEndpoint$$updateBlockInfo(BlockManagerMasterEndpoint.scala:332)	at org.apache.spark.storage.BlockManagerMasterEndpoint$$anonfun$receiveAndReply$1.applyOrElse(BlockManagerMasterEndpoint.scala:64)	at org.apache.spark.rpc.netty.Inbox$$anonfun$process$1.apply$mcV$sp(Inbox.scala:104)	at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:204)	at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:100)	at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:215)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)