Beaker TypeError - can't convert Symbol into Integer

beaker-exception

beaker-2.8.0/lib/beaker/dsl/helpers/host_helpers.rb:61:in `[]': can't convert Symbol into Integer (TypeError)
        from /home/card.co.uk/gavinw/.rvm/gems/ruby-1.9.3-p550@catsvc/gems/beaker-2.8.0/lib/beaker/dsl/helpers/host_helpers.rb:61:in `block in on'
        from /home/card.co.uk/gavinw/.rvm/gems/ruby-1.9.3-p550@catsvc/gems/beaker-2.8.0/lib/beaker/shared/host_manager.rb:95:in `run_block_on'
        from /home/card.co.uk/gavinw/.rvm/gems/ruby-1.9.3-p550@catsvc/gems/beaker-2.8.0/lib/beaker/dsl/patterns.rb:32:in `block_on'
        from /home/card.co.uk/gavinw/.rvm/gems/ruby-1.9.3-p550@catsvc/gems/beaker-2.8.0/lib/beaker/dsl/helpers/host_helpers.rb:54:in `on'
        from /home/card.co.uk/gavinw/.rvm/gems/ruby-1.9.3-p550@catsvc/gems/beaker-2.8.0/lib/beaker/dsl/helpers/host_helpers.rb:371:in `curl_on'
 

spec_helper_acceptance.rb

require 'beaker-rspec/spec_helper'
require 'beaker-rspec/helpers/serverspec'
require 'beaker/librarian'

unless ENV['BEAKER_provision'] == 'no'
  hosts.each do |host|
    # Install Puppet
    if host.is_pe?
      install_pe
    else
      install_puppet
    end
  end
end

RSpec.configure do |c|
  # Project root
  proj_root = File.expand_path(File.join(File.dirname(__FILE__), '..'))

  # Readable test descriptions
  c.formatter = :documentation

  # Configure all nodes in nodeset
  c.before :suite do

    hosts.each do |host|
      # Download accpetance SSH priv key
      curl_on(host, 'http://yum.test.card.co.uk/acceptance/id_rsa-github -o /root/.ssh/id_rsa')
      on host, 'chown 0600 /root/.ssh/id_rsa'

      # Setup librarian and install modules
      install_librarian(:librarian_version => '~>1.5.0')
      librarian_install_modules(proj_root, 'cataloguesvc')

      # Copy hiera data into default puppet location
      copy_hiera_data_to(host, 'spec/fixtures/hiera/hieradata/')
    end
  end
end