Android dependency 'com.android.support:support-v4' has different version for the compile (26.1.0) and runtime (27.1.1) classpath. You should manually set the same version via DependencyResolution

[sgremm]

I'm became the following error

Android dependency 'com.android.support:support-v4' has different version for the compile (26.1.0) and runtime (27.1.1) classpath. You should manually set the same version via DependencyResolution

[KarimMohamed20]

my problem in another app

[KarimMohamed20]

It was my issue but it 's now solved take a look about it
flutter/flutter#25862

[mdowais]

https://developer.android.com/jetpack/androidx/migrate

add the next 2 lines to gradle.properties this will solve the issue

android.useAndroidX=true
android.enableJetifier=true

The Reason is, there are breaking changes in the firebase_core.