using-actor blows up with following exception

[adam-singer]

http://www.scala-tour.com/#/using-actor

Exception in thread "main" com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'akka'
    at com.typesafe.config.impl.SimpleConfig.findKey(SimpleConfig.java:115)
    at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:138)
    at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:150)
    at com.typesafe.config.impl.SimpleConfig.find(SimpleConfig.java:155)
    at com.typesafe.config.impl.SimpleConfig.getString(SimpleConfig.java:197)
    at akka.actor.ActorSystem$Settings.<init>(ActorSystem.scala:135)
    at akka.actor.ActorSystemImpl.<init>(ActorSystem.scala:462)
    at akka.actor.ActorSystem$.apply(ActorSystem.scala:110)
    at akka.actor.ActorSystem$.apply(ActorSystem.scala:92)
    at akka.actor.ActorSystem$.apply(ActorSystem.scala:81)
    at Main$.main(scala-script3377883828921102494.scala:11)
    at Main.main(scala-script3377883828921102494.scala)
exit value is 1

Program exited.