Warning: Undefined array key "en" in /var/www/html/Core/Languages/TranslationService.php on line 31

Fatal error: Uncaught TypeError: Core\Languages\TranslationService::retrieveAllTranslationsForLanguage(): Return value must be of type array, null returned in /var/www/html/Core/Languages/TranslationService.php:31 Stack trace: #0 /var/www/html/Core/Languages/TranslationService.php(13): Core\Languages\TranslationService->retrieveAllTranslationsForLanguage('en') #1 /var/www/html/Controllers/Index.php(17): Core\Languages\TranslationService->__construct() #2 /var/www/html/Core/Essentials/Bootstrap.php(92): Controllers\Index->index() #3 /var/www/html/Core/Essentials/Bootstrap.php(28): Core\Essentials\Bootstrap->loadDefaultController() #4 /var/www/html/index.php(28): Core\Essentials\Bootstrap->init() #5 {main} thrown in /var/www/html/Core/Languages/TranslationService.php on line 31