Android Question Error while launching an android application on smartphone after successful compilation in B4A

[Hvau62]

Hi,
I am using the B4A software version 10.2.
After successful compilation with Android 10 library (API 29) and Java 8 JDK, I am not able to launch the application on my smartphone.
Enclosed is the error message given by the smartphone.
This is the first time I am getting this error message.
The previous version of my application with Android 9/Java 8 was working well.
Can you help me in solving this issue?

 

[josejad]

In this kind of situations, Erel use to answer:

The error happens because AndroidX sdk is missing.
Carefully follow these instructions: https://www.b4x.com/b4a.html

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[eps]

Some code would help!

 

[yfleury]

Connect your device to computer by usb cable.
Compile your app with b4a in debug mode and run it. Check your log

 

[Erel]

Moved to the questions forum.