Fatal error: Out of memory (allocated 18874368) (tried to allocate 65536 bytes) in /var/www/magento2/vendor/magento/module-tax/Model/Calculation.php on line 684

Fatal error: Out of memory (allocated 18874368) (tried to allocate 65536 bytes) in Unknown on line 0

Fatal error: Out of memory (allocated 18874368) (tried to allocate 65536 bytes) in Unknown on line 0