title: Running spark scala example fails
body: <p>I'm new to both Spark and Scala. I've created an IntelliJ Scala project with SBT and added a few lines to build.sbt.</p>
  
  <pre><code>name := "test-one"
  
  version := "1.0"
  
  scalaVersion := "2.11.2"
  
  libraryDependencies += "org.apache.spark" % "spark-core_2.10" % "1.1.0"
  </code></pre>
  
  <p>My version of Scala is 2.10.4 but this problem also occurs with 2.11.2</p>
  
  <pre><code>Exception in thread "main" java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class
      at akka.util.Collections$EmptyImmutableSeq$.&lt;init&gt;(Collections.scala:15)
      at akka.util.Collections$EmptyImmutableSeq$.&lt;clinit&gt;(Collections.scala)
      at akka.japi.Util$.immutableSeq(JavaAPI.scala:209)
      at akka.actor.ActorSystem$Settings.&lt;init&gt;(ActorSystem.scala:150)
      at akka.actor.ActorSystemImpl.&lt;init&gt;(ActorSystem.scala:470)
      at akka.actor.ActorSystem$.apply(ActorSystem.scala:111)
      at akka.actor.ActorSystem$.apply(ActorSystem.scala:104)
      at org.apache.spark.util.AkkaUtils$.org$apache$spark$util$AkkaUtils$$doCreateActorSystem(AkkaUtils.scala:121)
      at org.apache.spark.util.AkkaUtils$$anonfun$1.apply(AkkaUtils.scala:54)
      at org.apache.spark.util.AkkaUtils$$anonfun$1.apply(AkkaUtils.scala:53)
      at org.apache.spark.util.Utils$$anonfun$startServiceOnPort$1.apply$mcVI$sp(Utils.scala:1446)
      at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:160)
      at org.apache.spark.util.Utils$.startServiceOnPort(Utils.scala:1442)
      at org.apache.spark.util.AkkaUtils$.createActorSystem(AkkaUtils.scala:56)
      at org.apache.spark.SparkEnv$.create(SparkEnv.scala:153)
      at org.apache.spark.SparkContext.&lt;init&gt;(SparkContext.scala:203)
      at TweeProcessor$.main(TweeProcessor.scala:10)
      at TweeProcessor.main(TweeProcessor.scala)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:606)
      at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
  Caused by: java.lang.ClassNotFoundException: scala.collection.GenTraversableOnce$class
      at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
      at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
      ... 23 more
  </code></pre>
  
  <p>Tried looking up online, most answers point to a mismatch between API versions and Scala version, but none are specific to Spark.</p>