Got this error "java.lang.RuntimeException: no such class" when import extension

[Anke]

Facing issue with AI companion connection

It almost seems like I'm the only one with the USB connection working. For me it works on 2 different notebooks, on 3 different PCs with Win7 / Win10 with 15 different test devices (Android 4.x, 5.x, 7, 8.x, 9, 10, 11) and that for many years; actually since my first days with App Inventor.

USB - video

So where could the problem be?