WARN FileInputDStream:87 - Error finding new filesjava.lang.NullPointerException报错为什么

2022-04-05 11:29:30 WARN  FileInputDStream:87 - Error finding new files
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$ofRef.map(ArrayOps.scala:186)
    at org.apache.spark.streaming.dstream.FileInputDStream.findNewFiles(FileInputDStream.scala:206)
    at org.apache.spark.streaming.dstream.FileInputDStream.compute(FileInputDStream.scala:149)
    at org.apache.spark.streaming.dstream.DStream
    anonfun$getOrCompute$1
anonfun$1
anonfun$apply$7.apply(DStream.scala:342)atorg.apache.spark.streaming.dstream.DStream
anonfun$getOrCompute$1
anonfun$1
anonfun$apply$7.apply(DStream.scala:342)
    at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)
    at org.apache.spark.streaming.dstream.DStream
anonfun$getOrCompute$1
anonfun$1.apply(DStream.scala:341)
    at org.apache.spark.streaming.dstream.DStream
anonfun$getOrCompute$1
anonfun$1.apply(DStream.scala:341)
    at org.apache.spark.streaming.dstream.DStream.createRDDWithLocalProperties(DStream.scala:416)
    at org.apache.spark.streaming.dstream.DStream
anonfun$getOrCompute$1.apply(DStream.scala:336)atorg.apache.spark.streaming.dstream.DStream
anonfun$getOrCompute$1.apply(DStream.scala:334)
    at scala.Option.orElse(Option.scala:289)