Akka problems

gistfile1.txt

# build.sbt

name := "akka-chat"

version := "1.0"

resolvers += "spray repo" at "http://repo.spray.io"

libraryDependencies ++= Dependencies.demoAkka

# project/Depedencies.scala

object Library {

  // Versions
  val akkaVersion = "2.3.3"
  val logbackVersion = "1.0.13"
  val sprayVersion = "1.3.2"

  // Libraries
  val akkaActor = "com.typesafe.akka" %% "akka-actor" % akkaVersion
  val akkaSlf4j = "com.typesafe.akka" %% "akka-slf4j" % akkaVersion
  val logbackClassic = "ch.qos.logback" % "logback-classic" % logbackVersion
  val sprayCan = "io.spray" % "spray-can" % sprayVersion
}

object Dependencies {

  import Library._

  val demoAkka = List(akkaActor, akkaSlf4j, logbackClassic, sprayCan)
}

# IntelliJ error
Error:[info] Loading project definition from /projects/akka-chat/project
[error] /projects/akka-chat/project/Dependencies.scala:9: value % is not a member of String
[error]   val akkaActor = "com.typesafe.akka" % "akka-actor" % akkaVersion
[error]                                       ^
[error] /projects/akka-chat/project/Dependencies.scala:10: value % is not a member of String
[error]   val akkaSlf4j = "com.typesafe.akka" % "akka-slf4j" % akkaVersion
[error]                                       ^
[error] /projects/akka-chat/project/Dependencies.scala:11: value % is not a member of String
[error]   val logbackClassic = "ch.qos.logback" % "logback-classic" % logbackVersion
[error]                                         ^
[error] /projects/akka-chat/project/Dependencies.scala:12: value % is not a member of String
[error]   val sprayCan = "io.spray" % "spray-can" % sprayVersion
[error]                             ^
[error] four errors found
[error] (compile:compile) Compilation failed

You can fix it in this way:
val sprayCan = "io.spray" %% "spray-can" % sprayVersion