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java.lang.NullPointerException: 	at scala.collection.mutable.ArrayOps$ofRef$.length$extension(ArrayOps.scala:192)	at scala.collection.mutable.ArrayOps$ofRef.length(ArrayOps.scala:192)	at scala.collection.SeqLike$class.size(SeqLike.scala:106)	at scala.collection.mutable.ArrayOps$ofRef.size(ArrayOps.scala:186)	at scala.collection.mutable.Builder$class.sizeHint(Builder.scala:69)	at scala.collection.mutable.ArrayBuilder.sizeHint(ArrayBuilder.scala:22)	at scala.collection.TraversableLike$class.builder$1(TraversableLike.scala:230)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:233)	at scala.collection.mutable.ArrayOps$ofRef.map(ArrayOps.scala:186)	at SparkGraphGen$.main(CorrDistGraph.scala:53)	at SparkGraphGen.main(CorrDistGraph.scala)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.apache.spark.deploy.yarn.ApplicationMaster$$anon$2.run(ApplicationMaster.scala:627)