Rails 3 render layout in action causes error with Twitter Bootstrap

Im using twitter bootstrap for design. I want to use a different template for a specific action

def view
   render :layout => 'single'
   @movie = Movie.find(params[:id])
    respond_to do |format|
   format.html # show.html.erb
   format.json { render json: @movie }
  end
 end
 

As soon as i add in the render layout to the action I get this error message

undefined method `model_name' for NilClass:Class
 
  Extracted source (around line #2):
 
  1: <%- model_class = @movie.class -%>
  2: <h1><%=t '.title', :default => model_class.model_name.human %></h1>
  3: 
  4: <p>
  5:   <strong><%= model_class.human_attribute_name(:title) %>:</strong><br>
 

If I take the render away the page will load just fine.

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