I have this issue when i start my project. Happened when i updated my SDK. We can't use appcompat anymore.
B4A Version: 9.50 BETA #1
Java Version: 8
Parsing code. (1.30s)
Building folders structure. (0.26s)
Compiling code. (2.50s)
Compiling layouts code. (0.13s)
Organizing libraries. Error
Maven artifact not found: androidx.appcompat/appcompat-resources