object scala.runtime in compiler mirror not found.

[potan]

Error while running Scalex in sbt console:

run index scala-library 2.10.2 -input-dir ../scala-2.10.2/src/library/scala
[info] Running org.scalex.cli.Main index scala-library 2.10.2 -input-dir ../scala-2.10.2/src/library/scala

• source code -> nsc doc
  error: fatal error: object scala.runtime in compiler mirror not found.
  one error found
  ! scala.reflect.internal.MissingRequirementError: object scala.runtime in compiler mirror not found.
  java.lang.RuntimeException: Nonzero exit code: 1
  at scala.sys.package$.error(package.scala:27)
  [trace] Stack trace suppressed: run last compile:run for the full output.
  error Nonzero exit code: 1