Unresolved reference 'App'

So, here I am, another year, another ‘give it a try’ with Android.
It’s taken me a week to get the system ready to try Xojo with the Android Studio, having a full delete and reinstall.

I start a new app, add some controls to a window, (no code) select the emulator and run.
It runs once.
Try again, I get ‘unresolved reference: App’
As a Hail Mary, I change the App name to MyApp and run it.
That works.
I stop, add a control, try again,
‘unresolved reference Myapp’
and round and round I go.. I have to change the name of the app for every debug run.

This can’t be acceptable?