scala – Apache Spark：java.lang.NoSuchMethodError .rddToPai

Exception in thread “main” java.lang.NoSuchMethodError:
org.apache.spark.SparkContext$.rddToPairRDDFunctions(Lorg/apache/spark/rdd/RDD;Lscala/reflect/ClassTag;Lscala/reflect/ClassTag;Lscala/math/Ordering;)Lorg/apache/spark/rdd/PairRDDFunctions;
at SmokeStack$.main(SmokeStack.scala:46) at
SmokeStack.main(SmokeStack.scala) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498) at
org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:736)
at
org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:185)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:210)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:124)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

这是违规行：

val sigCounts = rowData.map(row => (row("Signature"),1)).countByKey()

rowData是RDD Map [String,String]. “签名”键存在于地图中的所有项目中.

我怀疑这可能是一个构建问题.下面是我的sbt文件：

name := "Example1"
version := "0.1"
scalaVersion := "2.11.8"

libraryDependencies += "org.apache.spark" %% "spark-core" % "1.2.0"
scalacOptions ++= Seq("-feature")

我是Scala的新手所以也许进口不正确？我有：

import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import scala.io.Source