Failed upgrade Serviio 1.6

When I upgrade it failed saying something (I forgot）couldn't download, then when I retry it says 'port undefined configured for this package is either used by another service or reserved for system use'. I restarted the NAS (DS213) but no help. I'm stuck here. Please help.

This problem blocks me for days. Help ...

[DenyAll]

See if any of this helps: http://www.forum.serviio.org/viewtopic.php?f=14&t=19275

See if any of this helps: http://www.forum.serviio.org/viewtopic.php?f=14&t=19275

I met the same problem as the last post. But how to completely remove serviio?

[DenyAll]

Best to ask there (as you have done) as you will get people with knowledge on the Synology responding.