Gradle task assembleDebug failed with exit code 1 Flutter / Dart Origin: On your device OSI layer 7 · Application Last updated 4 Nov 2026

Flutter: Exception: Gradle task assembleDebug failed with exit code 1

flutter run / flutter build apk stopped because the Gradle build failed; the real cause is printed above this line.

Exact message you may see Gradle task assembleDebug failed with exit code 1Exception: Gradle task assembleDebug failed with exit code 1Gradle task assembleRelease failed with exit code 1Gradle build failed to produce an .apk fileError: Gradle task assembleDebug failed with exit code 1
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Seen on: Flutter Android

Meaning

This line only reports that Gradle failed. Scroll up to the first "FAILURE: Build failed with an exception" and "What went wrong" block, or rerun with flutter run -v / ./gradlew assembleDebug --stacktrace in android/ for the full trace. Typical causes are SDK/JDK/plugin version mismatches, missing licenses, network problems downloading dependencies, or Kotlin/AGP version conflicts.

Common causes

  • JDK/Gradle/AGP version mismatch
  • compileSdk or minSdk conflicts
  • Missing Android licenses or SDK components
  • Network or proxy blocking dependency download
  • Kotlin version incompatible with plugins

⚡ Quick fix

  1. Read the "What went wrong" block above this line
  2. Run cd android && ./gradlew assembleDebug --stacktrace
  3. Run flutter clean, then flutter pub get, then rebuild

Detailed fix by platform

Flutter

  1. flutter run -v 2>&1 | tee build.log then search the log for "What went wrong"

How to diagnose

  1. Cause — What went wrong block?
  2. Versions — JDK, Gradle, AGP aligned?
  3. Network — Dependencies downloadable?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: On your device. Errors that are often confused with or caused by this one (click to open):

Android license status unknown / licenses not accepted — flutter doctor: Android license status unknown. Run `flutter doctor --android-licenses` to accept the SDK licenses (Flutter / Dart)Android license statu…Android resource linking failed — AAPT: error: resource x (aka y) not found — Android resource linking failed (Android)Android resource link…android:attr/lStar not found — AAPT: error: resource android:attr/lStar not found (Android)android:attr/lStar no…Cannot fit requested classes in a single dex file — Cannot fit requested classes in a single dex file (# methods: 65536 > 65536) — mergeDex failed (Android)Cannot fit requested …Cleartext HTTP traffic not permitted — Flutter (Android): java.io.IOException: Cleartext HTTP traffic to api.example.com not permitted (Flutter / Dart)Cleartext HTTP traffi…cmdline-tools component is missing — flutter doctor: Android SDK is missing command-line tools; download from https://goo.gl/XxQghQ — cmdline-tools component is missing (Flutter / Dart)cmdline-tools compone…Could not resolve — Gradle: Could not resolve all files for configuration / Could not resolve dependency (Android)Could not resolveDependency requires compileSdk — Dependency 'androidx.x:1.y' requires libraries and applications that depend on it to compile against version 34 or later of the Android APIs (Android)Dependency requires c…Gradle ta…

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