API 'variant.getExternalNativeBuildTasks()' is obsolete and has been replaced with 'variant.getExternalNativeBuildProviders()

The issue has been fixed in their latest release 'io.fabric.tools:gradle:1.30.0'

Please update your both gradle fabric tools with 1.30.0

buildscript {
  // ... repositories, etc. ...

   dependencies {
       // ...other dependencies ...
       classpath 'io.fabric.tools:gradle:1.30.0'
   }
}

For more details https://github.com/firebase/firebase-android-sdk/issues/198#issuecomment-473435453

EDIT

This issue has been fixed in Fabric 1.28.0. In your build.gradle of the project level, add the following line:

classpath 'io.fabric.tools:gradle:1.28.1'

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Previous Answer

It happens after I updated Android Studio to 3.3.0. apply plugin: 'io.fabric' is the cause. I have sent a bug report to Firebase team about this issue.

You have 3 options:

• Wait until the next version of Fabric plugin is released. Check the latest version here.

• Downgrade to Android Studio 3.2.1.

• Comment out io.fabric plugin.

In build.gradle of your app's module:

apply plugin: 'com.android.application'
// apply plugin: 'io.fabric' <== this plugin causes the error

However, you can still build and run your projects even though this error appears. Just ignore it.

in application build.gradle , downgrade to this stable version of gradle :

classpath 'com.android.tools.build:gradle:3.2.1'

It happens after I updated Android Studio to 3.3 , temp solution until they fix it !

edit: you don't need to downgrade your android studio !