Fatal error: Uncaught Symfony\Component\Cache\Exception\InvalidArgumentException: Cache key must be string, "NULL" given. in /home/smartgradepro/public_html/vendor/symfony/symfony/src/Symfony/Component/Cache/CacheItem.php:173 Stack trace: #0 /home/smartgradepro/public_html/vendor/symfony/symfony/src/Symfony/Component/Cache/Traits/AbstractTrait.php(289): Symfony\Component\Cache\CacheItem::validateKey(NULL) #1 /home/smartgradepro/public_html/vendor/symfony/symfony/src/Symfony/Component/Cache/Traits/AbstractAdapterTrait.php(42): Symfony\Component\Cache\Adapter\AbstractAdapter->getId(NULL) #2 /home/smartgradepro/public_html/src/Core/Localization/CLDR/DataLayer/LocaleCache.php(82): Symfony\Component\Cache\Adapter\AbstractAdapter->getItem(NULL) #3 /home/smartgradepro/public_html/src/Core/Data/Layer/AbstractDataLayer.php(91): PrestaShop\PrestaShop\Core\Localization\CLDR\DataLayer\LocaleCache->doRead(NULL) #4 /home/smartgradepro/public_html/src/Core/Localization/CLDR/LocaleDataSource.php(62): PrestaShop\PrestaShop\Core\Data\Layer\AbstractDataLayer->read(NULL) #5 /home/smartgradepro/public_html/src/Core/Localization/CLDR/LocaleRepository.php(58): PrestaShop\PrestaShop\Core\Localization\CLDR\LocaleDataSource->getLocaleData(NULL) #6 /home/smartgradepro/public_html/src/Core/Localization/Locale/Repository.php(173): PrestaShop\PrestaShop\Core\Localization\CLDR\LocaleRepository->getLocale(NULL) #7 /home/smartgradepro/public_html/src/Core/Localization/Locale/Repository.php(149): PrestaShop\PrestaShop\Core\Localization\Locale\Repository->getNumberSpecification(NULL) #8 /home/smartgradepro/public_html/classes/controller/Controller.php(209): PrestaShop\PrestaShop\Core\Localization\Locale\Repository->getLocale(NULL) #9 /home/smartgradepro/public_html/classes/controller/FrontController.php(284): ControllerCore->init() #10 /home/smartgradepro/public_html/classes/controller/Controller.php(300): FrontControllerCore->init() #11 /home/smartgradepro/public_html/classes/Dispatcher.php(510): ControllerCore->run() #12 /home/smartgradepro/public_html/index.php(29): DispatcherCore->dispatch() #13 {main} thrown in /home/smartgradepro/public_html/vendor/symfony/symfony/src/Symfony/Component/Cache/CacheItem.php on line 173