Fatal error: Uncaught Error: Undefined constant "WC_PLUGIN_FILE" in /home/xcogroup/public_html/shop.xcogroup.co.za/wp-content/plugins/cost-of-goods-for-woocommerce/includes/background-process/class-alg-wc-cog-bkg-process.php:18 Stack trace: #0 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-content/plugins/cost-of-goods-for-woocommerce/includes/class-alg-wc-cog-core.php(203): require_once() #1 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-content/plugins/cost-of-goods-for-woocommerce/includes/class-alg-wc-cog-core.php(139): Alg_WC_Cost_of_Goods_Core->init_bkg_process() #2 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-content/plugins/cost-of-goods-for-woocommerce/includes/class-alg-wc-cog-core.php(252): Alg_WC_Cost_of_Goods_Core->__construct() #3 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-content/plugins/cost-of-goods-for-woocommerce/includes/class-alg-wc-cog.php(239): require_once('/home/xcogroup/...') #4 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-content/plugins/cost-of-goods-for-woocommerce/includes/class-alg-wc-cog.php(117): Alg_WC_Cost_of_Goods->includes() #5 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-content/plugins/cost-of-goods-for-woocommerce/cost-of-goods-for-woocommerce.php(71): Alg_WC_Cost_of_Goods->init() #6 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-includes/class-wp-hook.php(324): {closure}('') #7 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #8 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #9 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-settings.php(578): do_action('plugins_loaded') #10 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-config.php(92): require_once('/home/xcogroup/...') #11 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-load.php(50): require_once('/home/xcogroup/...') #12 /home/xcogroup/public_html/shop.xcogroup.co.za/wp-blog-header.php(13): require_once('/home/xcogroup/...') #13 /home/xcogroup/public_html/shop.xcogroup.co.za/index.php(17): require('/home/xcogroup/...') #14 {main} thrown in /home/xcogroup/public_html/shop.xcogroup.co.za/wp-content/plugins/cost-of-goods-for-woocommerce/includes/background-process/class-alg-wc-cog-bkg-process.php on line 18