Zaktualizowałem moją Jommle do wersji 3.7.0. W efekcie strona przestała się wyświetlać i pojawił się komunikat HTTP ERROR 500
Z kolei na zapleczu witryn pojawia się komunikat:
Błąd

We have detected that your server is using PHP 5.3.29 which is obsolete and no longer receives official security updates by its developers. The Joomla! Project recommends upgrading your site to PHP 5.6 or later which will receive security updates at least until 31-12-18. Please ask your host to make PHP 5.6 or a later version the default version for your site. If your host is already PHP 5.6 ready please enable PHP 5.6 on your site's root and 'administrator' directories – typically you can do this yourself through a tool in your hosting control panel, but it's best to ask your host if you are unsure.

Co zrobiłem źle i co w danej sytuacji wypada mi czynić?