Fatal error: Out of memory (allocated 18874368) (tried to allocate 20480 bytes) in /var/www/magento2/vendor/magento/framework/View/Layout/ScheduledStructure/Helper.php on line 237

Fatal error: Out of memory (allocated 18874368) (tried to allocate 4096 bytes) in /var/www/magento2/vendor/magento/framework/Session/SessionManager.php on line 150