Android数据绑定构建错误:[数据绑定插件]:设置数据绑定失败

I'm playing around with the Android Data Binding library from Google, which I had working at one point. Now, it seems that "something" has changed and it is causing a problem for the Data Binding library. I'm stumped by a very generic error that is proving difficult to debug, a I'm playing around with the Android Data Bindin