code: def render_error_page(code, exc, mimetype='text/html', traceback=''):
      
      from giotto.views import get_jinja_template
  
      if 'json' in mimetype:
          return json.dumps({
              'code': code,
              'exception': exc.__class__.__name__,
              'message': str(exc),
          })
  
      et = get_config('error_template')
      if not et:
          return "%s %s\n%s" % (code, str(exc), traceback)
      template = get_jinja_template(et)
      return template.render(
          code=code,
          exception=exc.__class__.__name__,
          message=str(exc),
          traceback=traceback
      )
docs: Render the error page