Check out http://search.maven.org/#artifactdetails%7Corg.scala-lang.modules%7Cscala-java8-compat_2.11%7C0.5.0%7Cbundle

and you will see there is no "scala.compat.java8.FunctionConverters"

(Checking the "build.sbt" it looks like this should have been generated, I guess its not and something went wrong)