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

It turns out that this was because of the proxy, I then removed it from the property file and on settings then built a clean version.

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