Working under Windows10
It took me a while until I understood why I can't run my designed web application. I have to admit, that I'm not really familiar with VSC and its functionality logic.
Seems to be a case problem in the automatically generated files launch.json and task.json.
In launch.json the first entry is
but there is no task with that name in task.json, only a task with name "build". Its a bit clumsy to change the name in launch.json. because when you change the first letter to small, its changed back when storing the file. Anyway - after changing it from "Build" to "build" it possible to run the application.
The browser opens and shows an 404 invalid path error message, but maybe I can figure that out also by myself.
Any helpful hints are appreciated ;-)