Fatal error: Uncaught Error: Class "Locale" not found in /usr/share/icinga-php/ipl/vendor/ipl/i18n/src/Locale.php:125 Stack trace: #0 /usr/share/icinga-php/ipl/vendor/ipl/i18n/src/Locale.php(90): ipl\I18n\Locale->parseLocale() #1 /usr/share/php/Icinga/Application/Web.php(504): ipl\I18n\Locale->getPreferred() #2 /usr/share/php/Icinga/Application/ApplicationBootstrap.php(696): Icinga\Application\Web->detectLocale() #3 /usr/share/php/Icinga/Application/Web.php(106): Icinga\Application\ApplicationBootstrap->setupInternationalization() #4 /usr/share/php/Icinga/Application/ApplicationBootstrap.php(388): Icinga\Application\Web->bootstrap() #5 /usr/share/php/Icinga/Application/webrouter.php(105): Icinga\Application\ApplicationBootstrap::start() #6 /usr/share/icingaweb2/public/index.php(4): require_once('...') #7 {main} thrown in /usr/share/icinga-php/ipl/vendor/ipl/i18n/src/Locale.php on line 125