title: unresolved dependencies error in akka
body: <p>hi i am new on akka and m trying to develop sample akka application
  but when i execute run command on shell it gives me <strong>Unresolved Dependencies</strong> warnings and then shows error</p>
  
  <p>here is my Main.scala file</p>
  
  <pre><code>import akka.actor.Actor
  import akka.actor.ActorSystem
  import akka.actor.Props
   
  class HelloActor extends Actor {
    def receive = {
      case "hello" =&gt; println("hello back at you")
      case _       =&gt; println("huh?")
    }
  }
   
  object Main extends App {
    val system = ActorSystem("HelloSystem")
    // default Actor constructor
    val helloActor = system.actorOf(Props[HelloActor], name = "helloactor")
    helloActor ! "hello"
    helloActor ! "buenos dias"
  }
  </code></pre>
  
  <p>build.sbt</p>
  
  <pre><code>name := "tryakka"
  
  version := "1.0"
  
  scalaVersion := "2.11.1"
  
  resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"
  
  libraryDependencies += "com.typesafe.akka" %% "akka-actor" % "2.3.4"
  </code></pre>
  
  <p>following are the warnings and erors</p>
  
  <pre><code>[warn]  module not found: com.typesafe.akka#akka-actor_2.11.1;2.3.4
  [warn] ==== local: tried
  [warn]   /home/ahsen/.ivy2/local/com.typesafe.akka/akka-actor_2.11.1/2.3.4/ivys/ivy.xml
  [warn] ==== Typesafe Repository: tried
  [warn]   http://repo.typesafe.com/typesafe/releases/com/typesafe/akka/akka-actor_2.11.1/2.3.4/akka-actor_2.11.1-2.3.4.pom
  [warn] ==== public: tried
  [warn]   http://repo1.maven.org/maven2/com/typesafe/akka/akka-actor_2.11.1/2.3.4/akka-actor_2.11.1-2.3.4.pom
  [warn]  ::::::::::::::::::::::::::::::::::::::::::::::
  [warn]  ::          UNRESOLVED DEPENDENCIES         ::
  [warn]  ::::::::::::::::::::::::::::::::::::::::::::::
  [warn]  :: com.typesafe.akka#akka-actor_2.11.1;2.3.4: not found
  [warn]  ::::::::::::::::::::::::::::::::::::::::::::::
  [error] {file:/home/ahsen/SbtPrctc/tryakka/}default-240ba8/*:update: sbt.ResolveException: unresolved dependency: com.typesafe.akka#akka-actor_2.11.1;2.3.4: not found
  </code></pre>
  
  <p>thanks in advance</p>