Today I got this error that I never got before :
Error from Companion: edu.mit.appinventor.aicompanion3: One of RECEIVER_EXPORTED or RECEIVER_NOT_EXPORTED should be specified when a receiver isn't being registered exclusively for system broadcast
I'm really sorry, I made a mistake. I tried to remove the BluetoothLE extension from my app, but the bug was still there. Then, I removed the only other extension I have (NotificationStyle), and the bug disappeared. So there's nothing wrong with BluetoothLE; the issue is with NotificationStyle. I'm going to investigate further in this direction and check forums about that.
Oh, No
I looked for the latest version, but I never found this one.
It's 1.8, and I was and 1.7, and they talk about my issue so that probably the solution !
Thank you very much for all your help from both of you