undefined method save_callback

[onsails]

Hello. Here is a problem:

95-25-77-225:blogen smix$ script/sphinxsource.rb 
/Users/smix/.rvm/gems/ruby-1.8.7-p299/gems/couchrest_extended_document-1.0.0/lib/couchrest/extended_document.rb:146:in `method_missing': undefined method `save_callback' for Content:Class (NoMethodError)
    from /Users/smix/.rvm/gems/ruby-1.8.7-p299/gems/couchsphinx-0.2/./lib/mixins/indexer.rb:97:in `fulltext_index'
    from ./app/models/content.rb:14
    from /Users/smix/.rvm/rubies/ruby-1.8.7-p299/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /Users/smix/.rvm/rubies/ruby-1.8.7-p299/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from script/sphinxsource.rb:4

here is source:

http://gist.github.com/531554