This may be due to a broken publication of org.jetbrains:sbt-structure:latest.integration
that occurred tonight, about 4 or 5 hours ago. Given that your post is 4 hours old ...
You can see the ivy activity in idea.log
(~/Library/Logs/IntelliJIdea13
or ~/Library/Logs/IdeaIC13
on OSX).
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: UNRESOLVED DEPENDENCIES ::
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: org.jetbrains#sbt-structure;latest.integration: not found
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn]
[warn] Note: Some unresolved dependencies have extra attributes. Check that these dependencies exist with the requested attributes.
[warn] org.jetbrains:sbt-structure:latest.integration (sbtVersion=0.13, scalaVersion=2.10)
I have opened a ticket at JetBrains.