The problems of Multiple dex files define
usually arise when you have duplicate dependency entry in your app build.gradle
. In this case, you have a duplicate Firebase dependencies.
You need to use the same version either 9.0.2
or 9.6.1
:
compile 'com.google.firebase:firebase-auth:9.0.2'
compile 'com.google.firebase:firebase-database:9.0.2'
or
compile 'com.google.firebase:firebase-auth:9.6.1'
compile 'com.google.firebase:firebase-database:9.6.1'
Please be aware that if you use some support library version like 24.0.0
there is a chance for compatibility issue with firebase. You need to use the latest of support library or find the compatible firebase version. Read more at android error while compiling com.android.support:support-v4:24.0.0