Can't launch Flutter app from a multi-root workspace with a launch configuration

Environment

Flutter: 0.5.1 Beta Channel MacOS: 10.13.5 Visual Studio Code: 1.25 Dart Code: 2.15

Steps to Repro

1. Create a new plugin project:

flutter create -t plugin myplugin

1. Create a multi-root workspace file in the new project

{
    "folders": [
        {
            "path": "example",
            "name": "Example"
        },
        {
            "path": ".",
            "name": "Root"
        }
    ],
    "settings": {},
    "launch": {
        "configurations": [
            {
                "name": "Example Debug",
                "program": "/${workspaceFolder:Example}/lib/main.dart",
                "request": "launch",
                "type": "dart",
                "flutterMode": "debug"
            }
        ],
        "compounds": []
    }
}

1. Save As… the file as myplugin.code-workspace in the myplugin directory.

2. Open the myplugin workspace in VS Code using Open Workspace…

3. Press F5 to Start Debugging…

Actual Results:

The Debug controls window appears, the Status bar turns orange, and the Debug Console is displayed. Wait as long you like but no messages appear in the Debug Console and the app will never launch.

Expected Results:

The app launches into debug mode.

Logs:

There was no significant log output while the app was attempting to launch.

Dart Code extension: 2.15.0
Flutter extension: 2.15.0
Platform: mac
Workspace type: Flutter
Multi-root?: true
Dart SDK:
    Loc: /Users/tony/afero/flutter/bin/cache/dart-sdk
    Ver: 2.0.0-edge.c080951d45e79cd25df98036c4be835b284a269c
Flutter SDK:
    Loc: /Users/tony/afero/flutter
    Ver: 0.5.1

Wed Jul 11 2018 [12:44:11 GMT-0700 (PDT)] Log file started
Wed Jul 11 2018 [12:53:33 GMT-0700 (PDT)] Log file ended

Flutter Doctor

[✓] Flutter (Channel beta, v0.5.1, on Mac OS X 10.13.5 17F77, locale en-US)
    • Flutter version 0.5.1 at /Users/tony/afero/flutter
    • Framework revision c7ea3ca377 (6 weeks ago), 2018-05-29 21:07:33 +0200
    • Engine revision 1ed25ca7b7
    • Dart version 2.0.0-dev.58.0.flutter-f981f09760

[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
    • Android SDK at /Users/tony/Library/Android/sdk
    • Android NDK at /Users/tony/Library/Android/sdk/ndk-bundle
    • Platform android-27, build-tools 27.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
    • All Android licenses accepted.

[✓] iOS toolchain - develop for iOS devices (Xcode 9.4.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 9.4.1, Build version 9F2000
    • ios-deploy 1.9.2
    • CocoaPods version 1.5.3

[✓] Android Studio (version 3.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 26.0.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[✓] VS Code (version 1.25.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 2.14.0

[✓] Connected devices (2 available)
    • Ranger   • [REDACTED] • ios • iOS 11.4.1
    • iPhone X • 93ED801E-E0FB-4B97-8F7D-AB12185BEA9E     • ios • iOS 11.4 (simulator)

• No issues found!

Not sure why Flutter Doctor is reporting VS Code Flutter Extension v2.14. VS Code report v2.15. Here’s a screenshot of my installed extensions:

[c-cpt]

This worked for me.
{ “name”: “App-Name-Flutter”, “request”: “launch”, “type”: “dart”, “program”: “${workspaceFolder}/packages/name-app/lib/main.dart” }

[kibantony]

Here’s something interesting. I changed the path to:

     "program": "./example/lib/main.dart",

Pressed F5, and I get this error dialog: