title: NoSuchMethodError when using Spark and IntelliJ
body: <p>I'm new to Scala and Spark. I've been frustrated by how hard it has been to get things to work with IntelliJ. Currently, I can't get run the code below. I'm sure it's something simple, but I can't get it to work.</p>
  
  <p>I'm trying to run:</p>
  
  <pre><code>import org.apache.spark.{SparkConf, SparkContext}
  
  object TestScala {
    def main(args: Array[String]): Unit = {
      val conf = new SparkConf()
      conf.setAppName("Datasets Test")
      conf.setMaster("local[2]")
      val sc = new SparkContext(conf)
      println(sc)
    }
  }
  </code></pre>
  
  <p>The error I get is:</p>
  
  <pre><code>Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;
  at org.apache.spark.util.Utils$.getCallSite(Utils.scala:1413)
  at org.apache.spark.SparkContext.&lt;init&gt;(SparkContext.scala:77)
  at TestScala$.main(TestScala.scala:13)
  at TestScala.main(TestScala.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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
  </code></pre>
  
  <p>My build.sbt file:</p>
  
  <pre><code>name := "sparkBook"
  
  version := "1.0"
  
  scalaVersion := "2.12.1"
  </code></pre>