Hi DW, I'm experiencing an issue I've tried invalidating, fixed the offline sync but still I'm getting this error. My App uses Firebase FCM.
On the dependencies I have com.google.firebase:firebase-core:16.0.5 com.google.firebase:firebase-messaging:17.3.4
My implementation com.android.support:appcompact-v7:28.0.0-alpha1
This implementation is underlined with a red line and I think it is what having the issue, i remember now when I had this kind of error before I saw a post that said I must change the version here but don't know to which version to change to. If anyone know how can I fix this error please help me out. Thanks