Rails - Apr 2007 - error occurred while evaluating nil.accepts

I have an index method with a respond_to block that produces this
error:

NoMethodError (You have a nil object when you didn''t expect it!
The error occurred while evaluating nil.accepts):

The show method has the same respond_to block but doesn''t error out.
If I take the respond_to block out of the index method, it works.

If I give index params[:keywords] I get this error:

Amazon::Search::Request::TypeError (non-existent/unimplemented search
type: accepts):

Any advice?

Thanks,
--Dean

  def index
    unless params[:keywords].nil?
      @books = Array.new
      request = Amazon::Search::Request.new( DEV_TOKEN, ASSOCIATE_ID,
''us'' )
      response = request.keyword_search( params[:keywords] ) do |
product|
        @books.push( Book.new(  <snip snip> )  )
      end
    end
    respond_to do |f|
      f.html { }
      f.js   { }
    end
  end

  def show
    @book = Book.find(params[:id])
    respond_to do |f|
      f.html { }
      f.xml  { render :xml => @book.to_xml }
      f.js   { }
    end
  end


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