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java.lang.NoClassDefFoundError: org/eclipse/jetty/server/handler/GzipHandler**	at org.apache.spark.ui.JettyUtils$$anonfun$4.apply(JettyUtils.scala:235)	at org.apache.spark.ui.JettyUtils$$anonfun$4.apply(JettyUtils.scala:234)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)	at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)	at scala.collection.AbstractTraversable.map(Traversable.scala:105)	at org.apache.spark.ui.JettyUtils$.startJettyServer(JettyUtils.scala:234)	at org.apache.spark.ui.WebUI.bind(WebUI.scala:136)	at org.apache.spark.SparkContext$$anonfun$13.apply(SparkContext.scala:499)	at org.apache.spark.SparkContext$$anonfun$13.apply(SparkContext.scala:499)	at scala.Option.foreach(Option.scala:236)	at org.apache.spark.SparkContext.(SparkContext.scala:499)