How to migrate from Custom implementation to Active Android?

I have a a custom implementation (made by following this article) with two tables.

The app is currently live and has data which is stored only on phone and not synced anywhere.

I am in the process of adding more features and have found that the current implementation is reducing my development speed so I thought I'd switch to ActiveAndroid.

I rewrote the code hoping that no migrations would be needed and got the app to compile. But the data isn't there. Then, when I try to add new data through app's interface, the app just stops at the .save(); call.

Any idea how to move ahead with this?

Thanks!