Can only render or redirect once per action

    *
      base.rb:708 in render_with_no_layout
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.2/lib/action_controller/base.rb:708:in `render_with_no_layout'
    *
      layout.rb:256 in render_without_benchmark
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.2/lib/action_controller/layout.rb:256:in `render_without_benchmark'
    *
      benchmarking.rb:50 in render
      /usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.2/lib/action_controller/benchmarking.rb:50:in `render'
    *
      benchmark.rb:293 in measure
      /usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'