I see the issue, and it's a bug in Rockaway. It has to do with model subquery conditions that have no sub conditions. Basically, if you don't have any, you'll get the error. Adding a sub condition that always returns true (e.g. Id != null) is a workaround. I've replicated the issue in my dev org, and logged the bug. The fix looks pretty easy, so I think we can get this turned around pretty quickly. Thanks for helping find issues like this!
Edit: This issue has been resolved in Rockaway Point Release - Iteration 1 (and subsequent releases), available from the Skuid Releases page.