For any user of the Universal Recommender, version 0.7.0, for PIO 0.12.0 and Elasticsearch 5.x the build.sbt had an error which caused a failure during `pio build`. This is now fixed in the 0.7.0 tag and master branch. If you have already built Mahout from the ActionML fork, you should be able to pull the UR repo and `pio build` will now work. Otherwise follow instructions in the README.md here: https://github.com/actionml/universal-recommender/tree/0.7.0 <https://github.com/actionml/universal-recommender/tree/0.7.0>
Sorry for the inconvenience. Thanks to Dave Novelli for his persistence.
