Vote:
Bug 11009 – expose domain alias zimbraMailCatchAllAddress in admin console ui
Your missing part of the command (zimbraMailCatchAllAddress) but I assume you just re-typed it here with the mistake / said you followed the wiki & all was ok
Managing Domains - Zimbra :: Wiki
For the visible domain, you don't have to create domain level doc accounts for any domain if you don't want to / can use the global - what's the exact error say? (Or did you go ahead and create it already?) Note you can't remove those special accounts from the admin console:
Bug 22464 – DomainLevelWiki: Dont allow deleting domainlevelwiki once created or handle the problems