display_error_message

# File lib/rake/application.rb, line 185
    def display_error_message(ex)
      trace "#{name} aborted!"
      trace ex.message
      if options.backtrace
        trace ex.backtrace.join("\n")
      else
        trace Backtrace.collapse(ex.backtrace).join("\n")
      end
      trace "Tasks: #{ex.chain}" if has_chain?(ex)
      trace "(See full trace by running task with --trace)" unless
        options.backtrace
    end