Cannot resolve symbol

Hello all:

We have been developing for the RFD8500/TC51 for a few weeks now and the SDK and everything have been working great!

BUT recently all of the SDK references in our project just went to an error state in Android Studio and when you hover over a reference (ReaderDevice for example) we get the hint text "Symbol cannot be resolved" … We can no longer do any development since we cannot reference any of the SDK items???

BUT here the punch line … The project will still compile and run???

Thanks in advance...