spark dataframe读取特征报错的问题

val fileword =sc.textFile(path,1)

.map(x=>(x.split(",")(2152),Vectors.dense(x.split(",").map(_.toDouble).toList.take(2151).toArray)))

fileword.sample(false,0.1,2).foreach(println)

valschema =StructType(

StructField("label",StringType)

::StructField("features",VectorType)

::Nil

)//定义字段名称和格式

valrowRDD = fileword.map(p=>Row(p._1,p._2))//对rdd记录进行转换

valwordsDataFrame =sqlContext.createDataFrame(rowRDD,schema)//生成dataframe

wordsDataFrame.show(100)