ArgumentError (Invalid argument(s): A directory corresponding to fileSystemPath could not be found.

[benoitliard]

I'm actually trying to start the httpd to serve and assets folder.

_initServer() async {
    final server = await Dhttpd.start(
        path: '/assets/webapp',
        port: 8089,
        address: InternetAddress.loopbackIPv4);
}

E/flutter (31706): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: Invalid argument(s): A directory corresponding to fileSystemPath "/assets/webapps" could not be found

Any idea why?