The sample app for RestApiDoc plugin (https://github.com/loic911/restapidoc)
If you want to use with a local RestApiDoc plugin (github clone), edit your BuildConfig.
Add:
grails.plugin.location.restapidoc = "../restapidoc" (where ../restapidoc is the path of the plugin sources)
And remove:
compile ":rest-api-doc:0.5"