Not saving a book chapter from ACM portal

I've saved articles from this site before. Maybe this is failing because it's a reference to a book chapter?
http://portal.acm.org/citation.cfm?id=230050
  • A recent update to the ACM translator should fix the issue with the record you linked to. Your copy of Zotero should auto-update within 24 hours, or you can update manually by clicking Update Now in the General pane of the Zotero prefs.

    To open the preferences pane click the gear icon, this will open the actions dropdown menu. Select preferences from that dropdown menu.

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