def display_error_message(ex)
      $stderr.puts "#{name} aborted!"
      $stderr.puts ex.message
      $stderr.puts ex.backtrace.join("\n")
    end
def display_error_message(ex)
      $stderr.puts "#{name} aborted!"
      $stderr.puts ex.message
      $stderr.puts ex.backtrace.join("\n")
    end
Display the error message that caused the exception.