Android Question Error in Building App Based on Firebase Services

Which version of B4A are you using?

Make sure to follow the installation instructions: https://www.b4x.com/b4a.html

Thank you very much Erel for your help,
The compilation completed.

But the App abnormally terminated at this function
CallSubDelayed(FirebaseMessaging, "SubscribeToTopics")



The logger give this error:
*** Service (firebasemessaging) Create ***
** Service (firebasemessaging) Start **
firebasemessaging_subscribetotopics (java line: 228)
java.lang.NoSuchMethodError: No virtual method subscribeToTopic(Ljava/lang/StringV in class Lcom/google/firebase/messaging/FirebaseMessaging; or its super classes (declaration of 'com.google.firebase.messaging.FirebaseMessaging' appears in /data/app/fbr1.example--Ng9szRvYySJtSwjMuOXzA==/base.apk)
at anywheresoftware.b4a.objects.FirebaseNotificationsService$FirebaseMessageWrapper.SubscribeToTopic(FirebaseNotificationsService.java:130)
at fbr1.example.firebasemessaging._subscribetotopics(firebasemessaging.java:228)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:186)
at anywheresoftware.b4a.keywords.Common$11.run(Common.java:1154)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6940)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
--------- beginning of crash
firebasemessaging_subscribetotopics (java line: 228)
java.lang.NoSuchMethodError: No virtual method subscribeToTopic(Ljava/lang/StringV in class Lcom/google/firebase/messaging/FirebaseMessaging; or its super classes (declaration of 'com.google.firebase.messaging.FirebaseMessaging' appears in /data/app/fbr1.example--Ng9szRvYySJtSwjMuOXzA==/base.apk)
at anywheresoftware.b4a.objects.FirebaseNotificationsService$FirebaseMessageWrapper.SubscribeToTopic(FirebaseNotificationsService.java:130)
at fbr1.example.firebasemessaging._subscribetotopics(firebasemessaging.java:228)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:186)
at anywheresoftware.b4a.keywords.Common$11.run(Common.java:1154)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6940)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)


on the other hand, the java test program (sender) return success.
hope to find error and solve it

Thanks in advance.

Thank you very much Eng. Erel for your help,
It is work, thanks