undefined method `spreadsheet'

[dinamita]

I got the following error:
undefined method `spreadsheet' for #<ActionView::Base:0xb66c38b8>


I have the next:
/controllers/my_controller

require 'rubygems' # Optional
require 'zip/zipfilesystem' # Optional
require 'roo'
@rspreadsheet = Excelx.new("#{RAILS_ROOT}/lib/existing.xlsx")

/views/my_controller/my_view.html.erb
<%= spreadsheet @rspreadsheet, ["Tabelle"] %>
<%= spreadsheet @rspreadsheet, @rspreadsheet.sheets, ["Tabelle"] %>


I can read perfectly well the file. Nevertheless I cannot displayed at
views

Any suggestions?

Thanks