bravegag@Zeus:~/code/scala-play-angular-seed$ sbt "project frontend" run
[info] Loading global plugins from /home/bravegag/.sbt/1.0/plugins
[info] Loading settings for project scala-play-angular-seed-build from plugins.sbt ...
[info] Loading project definition from /home/bravegag/code/scala-play-angular-seed/project
[info] Loading settings for project root from ui-build.sbt,build.sbt ...
[info] Set current project to scala-play-angular-seed (in build file:/home/bravegag/code/scala-play-angular-seed/)
[error] Not a valid project ID: frontend (similar: root)
[error] project frontend
[error] ^