Causes a fatal error site down

Hello Sir,

Hello,

My site down due to this plugin according to WP notification:
“In this case, WordPress caught an error with one of your plugins, Cost of Goods for WooCommerce Pro”.

Error Details
=============
An error of type E_ERROR was caused in line 16 of the file /home/SorryHided/SorryHided.com/wp-content/plugins/cost-of-goods-for-woocommerce-pro/includes/background-process/class-alg-wc-cog-bkg-process.php. Error message: Uncaught Error: Class ‘WP_Background_Process’ not found in /home/SorryHided/SorryHided.com/wp-content/plugins/cost-of-goods-for-woocommerce-pro/includes/background-process/class-alg-wc-cog-bkg-process.php:16
Stack trace:
#0 /home/SorryHided/SorryHided.com/wp-content/plugins/cost-of-goods-for-woocommerce-pro/includes/class-alg-wc-cog-core.php(84): require_once()
#1 /home/SorryHided/SorryHided.com/wp-includes/class-wp-hook.php(307): Alg_WC_Cost_of_Goods_Core->init_bkg_process(”)
#2 /home/SorryHided/SorryHided.com/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#3 /home/SorryHided/SorryHided.com/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#4 /home/SorryHided/SorryHided.com/wp-settings.php(461): do_action(‘plugins_loaded’)
#5 /home/SorryHided/SorryHided.com/wp-config.php(92): require_once(‘/home/sorryhided…’)
#6 /home/SorryHided/SorryHided.com/wp-load.php(50): requir

Please help to avoid this problem happen again by fixing any bugs.

Thanks in advance!