VS Code: Error while applying breakpoint, "Breakpoint ignored because target path not found"

I am using chrome debugger extension in Visual Studio code to debug my backbone application. The launch.json file is like this;

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "chrome",
            "request": "launch",
            "name": "Launch Chrome against localhost",
            "url": "https://localhost:3000/authenticate/app/110020",
            "webRoot": "D:/Apps/app",
            "sourceMaps": false,
            "trace": "verbose"
        }
    ]
}

When i am trying to put a breakpoint in the app.js file which is present in "D:/Apps/app" directory, the following error is displayed, "Breakpoint ignored because target path not found". The file app.js is not minified or combined.