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java.lang.NullPointerException at scala.collection.mutable.ArrayOps$ofRef$.newBuilder$extension(ArrayOps.scala:112) at scala.collection.mutable.ArrayOps$ofRef.newBuilder(ArrayOps.scala:108) at scala.collection.TraversableLike$class.filter(TraversableLike.scala:262) at scala.collection.mutable.ArrayOps$ofRef.filter(ArrayOps.scala:108) at com.springml.spark.sftp.DefaultSource.copiedFile(DefaultSource.scala:227) at com.springml.spark.sftp.DefaultSource.writeToTemp(DefaultSource.scala:207) at com.springml.spark.sftp.DefaultSource.createRelation(DefaultSource.scala:113) at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:222) at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:148) at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:139) at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.<init>(<console>:34)