Multiple dex files define Lcom/google/android/gms/internal/zzau

Question

I get the error com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/internal/zzau; when i run my app The gradle files are

ap

Answer 1

I had the same problem but mine was cause by firebase-ui newest version 2.0.0. So I downgraded to 1.2.0 and added the following line to Project level build.gradle file:

allprojects {
    repositories {
        jcenter()

        // Add the following code
        maven {
            url 'https://maven.fabric.io/public'
        }
    }
}