We don’t recommend using the -l flag right now. It is still a work-in-progress.
In you’re above example, you’re using the watch task it looks like which will watch files and rebuild (which it did successfully) but there isn’t a server associated with that yet. We are working on a serve task right now.
Ultimately, developers will still use ionic serve and ionic run but the underlying implementation will be much simpler than it is today.
Thanks,
Dan