java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class

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java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class
at spray.http.Uri$Query.(Uri.scala:496)
at spray.http.Uri$Query$Empty$.(Uri.scala:575)
at spray.http.Uri$Query$Empty$.(Uri.scala)
at spray.http.parser.UriParser.(UriParser.scala:37)
at spray.http.Uri$.apply(Uri.scala:231)
at spray.http.Uri$.apply(Uri.scala:203)
at spray.http.Uri$.(Uri.scala:194)
at spray.http.Uri$.(Uri.scala)
at spray.http.Uri$Path$.build$1(Uri.scala:427)
at spray.http.Uri$Path$.apply(Uri.scala:428)
at spray.servlet.ConnectorSettings$.fromSubConfig(ConnectorSettings.scala:52)
at spray.servlet.ConnectorSettings$.fromSubConfig(ConnectorSettings.scala:46)
at spray.util.SettingsCompanion.apply(SettingsCompanion.scala:50)
at spray.servlet.Initializer$$anonfun$contextInitialized$1.apply$mcV$sp(Initializer.scala:40)
at akka.util.Switch.transcend(LockUtil.scala:27)
at akka.util.Switch.switchOn(LockUtil.scala:48)
at spray.servlet.Initializer.contextInitialized(Initializer.scala:33)

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