parameters: (self, error_prefix)
docstring: Builds error message string escaping it for HTML.
  
      Args:
        error_prefix: an error prefix.
      Returns:
        HTML escaped error message.
docstring_summary: Builds error message string escaping it for HTML.
docstring_tokens: Builds error message string escaping it for HTML .
function: def ToString(self, error_prefix):
      """Builds error message string escaping it for HTML.
  
      Args:
        error_prefix: an error prefix.
      Returns:
        HTML escaped error message.
      """
      if error_prefix:
        return utils.HtmlEscape("{0}: {1}".format(
            error_prefix,
            str(self.args[0] if len(self.args) <= 1 else self.args)))
      else:
        return utils.HtmlEscape("Error: {0}".format(
            str(self.args[0] if len(self.args) <= 1 else self.args)))
function_tokens: def ToString ( self , error_prefix ) : if error_prefix : return utils . HtmlEscape ( "{0}: {1}" . format ( error_prefix , str ( self . args [ 0 ] if len ( self . args ) <= 1 else self . args ) ) ) else : return utils . HtmlEscape ( "Error: {0}" . format ( str ( self . args [ 0 ] if len ( self . args ) <= 1 else self . args ) ) )