Fatal error: Uncaught Error: Class "WC_Shipping_Flat_Rate" not found in /home/samipe/public_html/wp-content/plugins/CTT-for-woocommerce-2/includes/shipping-methods/class-CTT-shippingCTTShippingCTT.php:5 Stack trace: #0 {main} thrown in /home/samipe/public_html/wp-content/plugins/CTT-for-woocommerce-2/includes/shipping-methods/class-CTT-shippingCTTShippingCTT.php on line 5