acts_as_ferret ActsAsFerret::IndexNotDefined

Hello! I use acts_as_ferret at first. I have several models with acts_as_ferret. When I do search in the models User,Article,Therm it works fine. But when I try search in Addition model or in Page model I got following error message: ActsAsFerret::IndexNotDefined addition

in the string: @results = Addition.find_with_ferret(params[:q])

or ActsAsFerret::IndexNotDefined page

in the string: @results = Page.find_with_ferret(params[:q])

Where is mistake? Thanks!

Problem solved. Helped restarting ferret_server and rebuilding indexes for models