Android Question java.lang.NoClassDefFoundError: androidx.appcompat.widget.AppCompatTextView

Hi,
How to solve this problem?
When I convert Basic to Androidx, when compiling a project, I see the following error:

java.lang.NoClassDefFoundError: androidx.appcompat.widget.AppCompatTextView
at com.google.android.material.textfield.TextInputLayout.setCounterEnabled(TextInputLayout.java:1561)
at de.amberhome.objects.FloatlabelEditTextWrapper.DesignerCreateView(FloatlabelEditTextWrapper.java:100)
at anywheresoftware.b4a.objects.CustomViewWrapper.AfterDesignerScript(CustomViewWrapper.java:70)
at anywheresoftware.b4a.keywords.LayoutBuilder.loadLayout(LayoutBuilder.java:162)
at anywheresoftware.b4a.objects.ActivityWrapper.LoadLayout(ActivityWrapper.java:209)
at com.ali.shojaee.main._activity_create(main.java:382)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at com.ali.shojaee.main.afterFirstLayout(main.java:104)
at com.ali.shojaee.main.access$000(main.java:17)
at com.ali.shojaee.main$WaitForLayout.run(main.java:82)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)