Problem activating 'Document Rating Search'

May 23, 2011 at 8:36 AM


when I try activating the 'Document Rating Search' farm feature in Central Administration, I get the following error...

       Could not find the required crawled properties => ows_RateValue

ContentType data has been entered and a full crawl taken place.

Can anyone advise why this is happening?

Many Thanks

Adam Talbot