Critical Error after Activating plugin

Hi, I get this critical error as soon as the plugin is activated:

An error of type E_COMPILE_ERROR was caused in line 54 of the file /var/www/vhosts/dev.sgagolfclub.com.au/httpdocs/wp-content/plugins/gateway-woocommerce-module-master/woocommerce-mastercard.php. Error message: require_once(): Failed opening required ‘vendor/autoload.php’ (include_path=’.:/opt/plesk/php/7.3/share/pear’)

Any help would be greatly appreciated. ?? Jas.