[error] Class com.google.firebase.iid.zzb extended by class com.google.firebase.messaging.FirebaseMessagingService is inaccessible

 

[오류 사항]

2020-07-03 15:20:03.999 15123-15123/com.skdnd.episode E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.skdnd.episode, PID: 15123
    java.lang.IllegalAccessError: Class com.google.firebase.iid.zzb extended by class com.google.firebase.messaging.FirebaseMessagingService is inaccessible (declaration of 'com.google.firebase.messaging.FirebaseMessagingService' appears in /data/app/com.skdnd.episode-8kj7u9VCYdSFcqVvpOpVvw==/base.apk)
        at java.lang.VMClassLoader.findLoadedClass(Native Method)
        at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.AppComponentFactory.instantiateService(AppComponentFactory.java:129)
        at androidx.core.app.CoreComponentFactory.instantiateService(CoreComponentFactory.java:68)
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:4135)
        at android.app.ActivityThread.access$1600(ActivityThread.java:267)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1997)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:237)
        at android.app.ActivityThread.main(ActivityThread.java:7770)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1047)

 

[해결방법]

1. classpath 'com.google.gms:google-services:3.2.0'

2. implementation 'com.google.firebase:firebase-messaging:18.0.0'
    implementation 'com.google.firebase:firebase-iid:18.0.0'