Android build error (Firebase)Android: “Execution failed for task ‘:app:mapDebugSourceSetPaths’” (extraGeneratedResDir)

Why the task fails, and the fix

1. 01

   An old google-services plugin with a newer Android Gradle plugin

   “google-services plugin 4.3.14 Improved task caching and awareness of changes in google-services.json files.” Firebase, Firebase Android release notes

   An old plugin, 4.3.13 or earlier, often triggers it on newer Android Gradle plugin releases, and developers report the error going away on 4.3.14 or later, whose release notes mention improved task caching. Use the version in Firebase’s setup guide (4.5.0 on November 8, 2026). Change only the version number and keep apply false.

   // android/settings.gradle.kts (Flutter)
   plugins {
       id("com.google.gms.google-services") version "4.5.0" apply false
   }
   
   // or android/build.gradle (older buildscript style)
   // classpath 'com.google.gms:google-services:4.5.0'

2. 02

   The version is set in a place you didn’t change

   “In your root-level (project-level) Gradle file (<project>/build.gradle.kts or <project>/build.gradle), add the Google services Gradle plugin as a dependency:” Firebase, Add Firebase to your Android project

   Projects that went through several Flutter templates can declare the plugin twice: a classpath in android/build.gradle and a plugins line in android/settings.gradle. Search both and keep one, at the current version.

   grep -rn "google-services" android/*.gradle* android/app/build.gradle*

3. 03

   Old build output after the version change

   Gradle can keep failing on cached task output from the old plugin. Clean once, then build.

   flutter clean
   flutter pub get
   flutter run
   
   # native Android
   ./gradlew clean assembleDebug

Checked against the vendor’s docs on November 8, 2026: Firebase: Add Firebase to your Android project; Firebase Android release notes (google-services plugin).

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Related: Firebase “google-services” plugin not found · Gradle “Could not resolve all files” · Android “SDK location not found” · Firebase auth/network-request-failed