Flutter : Target file "lib/main.dart" not found


When I perform a flutter run I get an error

Target file “lib/main.dart” not found.

Why is this happening and how can I fix this ?


You can run any file from any DIR provided that you set the target file path, example:

flutter run -t lib/main_dev.dart


flutter run lib/dev/main_dev.dart

UPDATE (2020 February 5th)

It is however not advisable to remove main.dart from your project.

I’m sure most of you found this link because you are setting up / configuring your app to accommodate for different environments e.g. dev, stg, beta and prod.



void main() async {
  dynamic configuredApp = AppConfig(
    appName: 'Flutter',
    flavorName: 'development',
    appVersion: 1.0,
    apiBaseUrl: 'https://dev-api.example.com/'



class App extends StatefulWidget {
  final dynamic configuredApp;


  _AppState createState() => _AppState();

As it turns out some build steps will fail in Android Studio mostly Gradle related if you don’t have a main.dart file and method main() {} referenced inside this file.

  • Common build errors (AndroidX migrate, APK build etc.)
  • More info / solutions below related to flutter build error: finished with non-zero exit value 1

    1. issuecomment
    2. issuecomment
    3. issuecomment

An alternative to flutter run -t lib/main_dev.dart
in VS Code with the debugger tool.

  • Click “Add Configuration” and add the following or add manually:


  "configurations": [

      "name": "Flutter",
      "request": "launch",
      "type": "dart",
      // "args": ["--enable-software-rendering"]
      // "flutterMode": "profile", //debug //release 
      "program": "${workspaceFolder}/lib/main_dev.dart"

Hope this helps.

Answered By – Elroy

Answer Checked By – Candace Johnson (FlutterFixes Volunteer)

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