SDK 3.1 Robot Controller app cannot find Rev Expansion Hub

[train_depot]

When I download the controller app from the app store it works fine. It finds the Rev Expansion hub and lets me make a configuration. But when I build the app in Android Studio it cannot find any USB devices.

If I try activating a configuration on the phone that was set up with the app store app, I get the following error:

unable to create robot:Robot failed to start:Attempt to invoke interface method 'boolean.com.qualcomm.robotcore.hardware.configura tion.ConfigurationType.isDeviceFlavor(com.qualcomm .robotcore.hardware.configuration.UserConfiguratio nType$Flavor)' on a null object reference

Any suggestions?

[train_depot]

Turns out to be the "Instant Run" problem. Instant Run needs to be disabled Android Studio in File->Settings->Build, Execution, Deployment->Instant Run

[RedfishRobotics]

Thanks train_depot , we had the same problem with our first test of the new controller and this corrections solved it instantly: https://youtu.be/K7jF0Er6kGI