If you are new to Zend Framework you might land on this error after trying to use MvcTranslator module
Fatal error: Method Zend\View\Helper\HeadTitle::__toString() must not throw an exception
The solution to this error is very simple, HeadTitle is using the MvcTranslator and the translator needs the PHP extension intl, so just install and enable php-intl, no matter what PHP version you have.