Fatal error: Class 'RulesI18nStringController' not found in entity.i18n.inc on line 31
You have $update_free_access variable in your settings.php file. Set it to:

$update_free_access = TRUE;


You will be able to run update.php without login. Don't forget to turn it back to FALSE when done - if left TRUE, it can open your site to DoS attacks.