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

Question

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 ?

Answer 1

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

flutter run -t lib/main_dev.dart 

OR

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.

Example:

main_dev.dart:

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

main.dart

class App extends StatefulWidget {   final dynamic configuredApp;    App(this.configuredApp);    @override   _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

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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:

.vscode/launch.json

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

Hope this helps.