Scala : java.lang.IllegalArgumentException: requirement failed: nonEmpty input - scala

Question

I have written a code to process tiff files , do map algebra operations and store the result back as tiff file. When am running the code am getting this error. I am passing only one argument to the code which is a file path. What could be causing the error?
Error :
Exception in thread "main" java.lang.IllegalArgumentException: requirement failed: nonEmpty input
at scala.Predef$.require(Predef.scala:233)
at geotrellis.spark.stitch.TileLayoutStitcher$.stitch(StitchRDDMethods.scala:21)
at geotrellis.spark.stitch.SpatialTileLayoutRDDMethods.stitch(StitchRDDMethods.scala:42)
at RasterData.RasterOperations.MapAlgebraOperations$.readHdfsTiles(MapAlgebraOperations.scala:97)
at RasterData.RasterOperations.MapAlgebraOperations$.main(MapAlgebraOperations.scala:27)
at RasterData.RasterOperations.MapAlgebraOperations.main(MapAlgebraOperations.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:685)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
code:
object MapAlgebraOperations {
def main(args: Array[String]) : Unit = {
readHdfsTiles(args(0))
}
def readHdfsTiles(readpath: String): TileLayerRDD[SpatialKey] = {
implicit val sc = SparkUtils.createSparkContext("MapAlgebra")
//layer name for reading the RasterRDD
val nlcd1 = new String("nlcd1")
val nlcd2 = new String("nlcd2")
//Hadoop Tiles Location
val HdfsPath = new Path(readpath)
val reader = HadoopLayerReader(HdfsPath)(sc)
val rastereurope = reader.read[SpatialKey, Tile, TileLayerMetadata[SpatialKey]](LayerId(nlcd1, 1))
val rasterasia = reader.read[SpatialKey, Tile, TileLayerMetadata[SpatialKey]](LayerId(nlcd2, 1))
// Local Operations on Tiles
// Add 100 to each cell on raster Europe
val AddRasterEurope: RDD[(SpatialKey, Tile)] with Metadata[TileLayerMetadata[SpatialKey]] = rastereurope.withContext { _ localAdd 100 }
// Subtract 5 to each cell on raster Asia
val SubtractRasterAsia: RDD[(SpatialKey, Tile)] with Metadata[TileLayerMetadata[SpatialKey]] = rasterasia.withContext { _ localSubtract 1 }
// Union
val EuropeUnionAsia: RDD[(SpatialKey, Tile)] with Metadata[TileLayerMetadata[SpatialKey]] = rastereurope.withContext { _ union(SubtractRasterAsia) }
//Intersection
val EuropeIntersectAsia: RDD[(SpatialKey, Tile)] with Metadata[TileLayerMetadata[SpatialKey]] = rastereurope.withContext { _ intersection(rasterasia) }
//focal operations on Europe
val focalEurope = rastereurope.focalMean(Circle(5))
//Chain Focal Operations
val focalEuropeChain = focalEurope.focalMean(Circle(5))
//LeftOuterJoin
//val LeftOuterJoin = rastereurope.leftOuterJoin(rasterasia).updateValues(Add(_, _))
//Crop India from Asia
//Spatial Join
//val EuropeSpatialJoinAsia = rastereurope.spatialJoin(rasterasia)
//Define new layer
//val layerid1 = new LayerId("newnlcd1",1)
//val layerid2 = new LayerId("newnlcd2",1)
//val layerid3 = new LayerId("newnlcd3",1)
//Writing the resultant RDD to HDFS
//val writer = HadoopLayerWriter(HdfsPath)(sc)
//writer.write(layerid1, rddWithContext, ZCurveKeyIndexMethod)
//writer.write(layerid2, rddWithContext1, ZCurveKeyIndexMethod)
//writer.write(layerid3, rddWithContext2, ZCurveKeyIndexMethod)
//Convert the data into GeoTiff
val addrasterEurope = AddRasterEurope.stitch
GeoTiff(addrasterEurope, AddRasterEurope.metadata.crs).write("/home/brillio/tiffs/AddRasterEurope.tiff")
val subrasterAsia = SubtractRasterAsia.stitch
GeoTiff(subrasterAsia, SubtractRasterAsia.metadata.crs).write("/home/brillio/tiffs/SubtractRasterAsia.tiff")
val rasterUnion = EuropeUnionAsia.stitch
GeoTiff(rasterUnion, EuropeUnionAsia.metadata.crs).write("/home/brillio/tiffs/EuropeUnionAsia.tiff")
val rasterIntersect = EuropeIntersectAsia.stitch
GeoTiff(rasterIntersect, EuropeIntersectAsia.metadata.crs).write("/home/brillio/tiffs/EuropeIntersectAsia.tiff")
val rasterfocal = focalEurope.stitch
GeoTiff(rasterfocal, focalEurope.metadata.crs).write("/home/brillio/tiffs/rasterfocal.tiff")
val rasterChainfocal = focalEuropeChain.stitch
GeoTiff(rasterChainfocal, focalEuropeChain.metadata.crs).write("/home/brillio/tiffs/rasterChainfocal.tiff")
//val EuropeLeftOuterAsia = LeftOuterJoin.stitch
//GeoTiff(EuropeLeftOuterAsia, LeftOuterJoin.metadata.crs).write("/home/brillio/tiffs/rasterChainfocal.tiff")
//val rasterres3 = EuropeSpatialJoinAsia.stitch
//GeoTiff(rasterres3, EuropeSpatialJoinAsia.metadata.crs).write("/home/brillio/tiffs/EuropeSpatialJoinAsia.tiff")
AddRasterEurope
}
}