You were using a very old version of WordPress (3.4.1). I have tried to update your site, but it still throws errors.
Could you please download the latest version of WordPress and re-install it on your site and that should resolve your issues.
WordPress recommends PHP 7.2 or higher (https://wordpress.org/about/requirements/), however we do recommend at least PHP 5.6.32 or later to avoid any incompatibility issues.
Let us know how it goes.