Android Question BiometricManager - FATAL EXCEPTION

[RobertoS]

Hi,
using the example for the 'use of biometric function downloaded from this link ( https://www.b4x.com/android/forum/threads/biometricmanager-biometric-authentication.111256/#content ) the app I have a problem that I can not solve.
the app is regularly installed , but on startup it closes with no errors in the log.
Only with the command "adb trace" I saw the stack of error calls:

11-21 14:45:15.722 28905 28905 D AndroidRuntime: Shutting down VM
11-21 14:45:15.722 28905 28905 E AndroidRuntime: FATAL EXCEPTION: main
11-21 14:45:15.722 28905 28905 E AndroidRuntime: Process: b4a.example, PID: 28905
11-21 14:45:15.722 28905 28905 E AndroidRuntime: java.lang.NoClassDefFoundError: Failed resolution of: Lkotlin/jvm/internal/Intrinsics;
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at androidx.savedstate.SavedStateRegistryController$Companion.create(Unknown Source:2)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at androidx.savedstate.SavedStateRegistryController.create(Unknown Source:2)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at androidx.activity.ComponentActivity.<init>(ComponentActivity.java:146)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at androidx.fragment.app.FragmentActivity.<init>(FragmentActivity.java:108)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at androidx.appcompat.app.AppCompatActivity.<init>(AppCompatActivity.java:94)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at b4a.example.main.<init>(main.java:17)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at java.lang.Class.newInstance(Native Method)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.Instrumentation.newActivity(Instrumentation.java:1254)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3454)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3710)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2146)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:106)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.os.Looper.loop(Looper.java:236)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:8057)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:656)
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:967)
11-21 14:45:15.722 28905 28905 E AndroidRuntime: Caused by: java.lang.ClassNotFoundException: kotlin.jvm.internal.Intrinsics
11-21 14:45:15.722 28905 28905 E AndroidRuntime:     ... 21 more

What can it be due to?

Thank you very much

Roberto

 

[Erel]

Make sure to use B4A v12 and add a reference to AppCompat library.

 

[RobertoS]

Make sure to use B4A v12 and add a reference to AppCompat library.

Resolved!
In the project was missing the selection for the AppCompat library.

Thank you!