Failed to find byte code for com/symbol/emdk/EMDKManager$EMDKListener

Hi, just upgrading (finally) from our old MC55 devices to TC56 so need to learn a bit of new code. Been trying out some of the example projects but I keep getting the following error when trying to run the app:

Failed to find byte code for com/symbol/emdk/EMDKManager$EMDKListener

Any advice on what I'm doing wrong? I'm using Android studio 3.1.1, EMDK v6.8.