Fatal error: Uncaught Error: Interface "WPDesk\FS\TableRate\Rule\Cost\AdditionalCost" not found in /home/samipe/public_html/wp-content/plugins/flexible-shipping/vendor_prefixed/octolize/flexible-shipping-rules/src/TableRate/Rule/Cost/AbstractAdditionalCost.php:157 Stack trace: #0 {main} thrown in /home/samipe/public_html/wp-content/plugins/flexible-shipping/vendor_prefixed/octolize/flexible-shipping-rules/src/TableRate/Rule/Cost/AbstractAdditionalCost.php on line 157