我试图使用ApacheSpark中提供的sqlcontext使用下面的代码查询存储在hdfs中的文件，但是我得到了一个nosuchmethoderror

package SQL

import org.apache.spark.SparkContext 
import org.apache.spark.sql._

object SparSQLCSV {   def main(args: Array[String]) {

    val sc = new SparkContext("local[*]","home")
    val sqlContext = new org.apache.spark.sql.SQLContext(sc)
    val people = sc.textFile("/home/devan/Documents/dataset/peoplesTest.csv")
    val delimiter = ","
    val schemaString = "a,b".split(delimiter)//csv header
    //Automated Schema creation
    val schema =   StructType(schemaString.map(fieldName => StructField(fieldName, StringType, true)))
    val peopleLines = people.flatMap(x=> x.split("\n"))
    val rowRDD = peopleLines.map(p=>{
      Row.fromSeq(p.split(delimiter))
    })
    val peopleSchemaRDD = sqlContext.applySchema(rowRDD, schema)
    peopleSchemaRDD.registerTempTable("people")
    sqlContext.sql("SELECT b FROM people").foreach(println)

  } }

线程“main”java.lang.nosuchmethoderror中出现异常：org.apache.spark.sql.sqlcontext.applyschema（lorg/apache/spark/rdd/rdd；lorg/apache/spark/sql/types/structtype；）lorg/apache/spark/sql/dataframe；烫伤时.main对象$.main（main对象。scala:34)在sun.reflect.nativemethodaccessorimpl.invoke0（本机方法）在sun.reflect.nativemethodaccessorimpl.invoke（本机方法）在sun.reflect.nativemethodaccessorimpl.invoke（本机方法）在烫伤时。java:57)在sun.reflect.delegatingmethodaccessorimpl.invoke（delegatingmethodaccessorimpl。java:43)在java.lang.reflect.method.invoke（方法。java:606)在org.apache.spark.deploy.sparksubmit$.launch（sparksubmit。scala:358)位于org.apache.spark.deploy.sparksubmit$.main（sparksubmit.com）。scala:75)位于org.apache.spark.deploy.sparksubmit.main（sparksubmit.scala）
我也用spark中提供的命令行尝试过同样的方法，但是当我创建一个scala项目并尝试运行它时，我得到了上面的错误。我做错什么了？