Flutter - Build failed during 'assembleDebug'

Asked Jan 23 '20 at 10:59

Active Jan 23 '20 at 11:09

Viewed 85 times

In the last one month I don't work with Flutter. Now I can't start apps. I tried everything, but nothing works. If I start to run a basic app, this error message appear in the console:

Launching lib\main.dart on SM G960F in debug mode...
Running Gradle task 'assembleDebug'...
Finished with error: Gradle task assembleDebug failed with exit code -1

Sometimes if I open the android folder and start there the app, it works fine. Maybe the problem is the Android SDK. If I run flutter doctor there is an error:

[!] Android toolchain - develop for Android devices (Android
    SDK version 29.0.2)
    X Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or
      visit https://flutter.dev/setup/#android-setup for
      detailed instructions.

I tried to uninstall Flutter and Android Studio - nothing works. It would be great if someone of you could help me. Thanks.

edited Jan 23 '20 at 11:09

Augustin R

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asked Jan 23 '20 at 10:59

Jonas Frei

Please install necessary build tools as mentioned in error log – silentsudo Jan 23 '20 at 11:19
try using flutter clean command then run – Aamil Silawat Jan 23 '20 at 11:28
@AR I already tried it. It doesn't change something – Jonas Frei Jan 23 '20 at 11:47
@silentsudo I already installed the sdk tools from https://developer.android.com/studio/#downloads. But this doesn't helped me too, because I can't open the sdkManager – Jonas Frei Jan 23 '20 at 11:49
Can you try this https://stackoverflow.com/questions/14504325/cant-get-android-sdk-manager-to-open – silentsudo Jan 23 '20 at 11:54

Flutter - Build failed during 'assembleDebug'

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