Here's their tech blog post about it: https://netflixtechblog.com/orchestrating-data-ml-workflows-...
> Did not resolve 'com.github.vmg.protogen:protogen-annotations:1.0.0' which is part of the dependency lock state
./run.sh maestro
Takes a few mins to get all the dependencies and build, but it definitely works.
Perhaps you're missing some dependency steps before hand if you're hand cranking gradle.