Warning: Class "YITH\PluginUpgrade\Upgrade" not found in /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-upgrade/includes/loader.php on line 104

Fatal error: Uncaught Error: Failed opening required '/home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-upgrade/includes/upgrade.php' (include_path='.:/opt/alt/php81/usr/share/pear:/opt/alt/php81/usr/share/php:/usr/share/pear:/usr/share/php') in /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-upgrade/includes/loader.php:71 Stack trace: #0 [internal function]: YITH\PluginUpgrade\Loader::autoload('YITH\\PluginUpgr...') #1 /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-upgrade/includes/loader.php(104): class_alias('YITH\\PluginUpgr...', 'YITH_Plugin_Upg...') #2 /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-upgrade/includes/loader.php(46): YITH\PluginUpgrade\Loader::define_class_aliases() #3 /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-upgrade/includes/loader.php(120): YITH\PluginUpgrade\Loader::init() #4 /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-upgrade/lib/yit-licence.php(19): require_once('/home/valigeria...') #5 /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-fw/yit-functions.php(1557): include_once('/home/valigeria...') #6 /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-fw/includes/class-yit-upgrade.php(49): yith_plugin_fw_load_update_and_licence_files() #7 /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-waiting-list-premium/includes/class.yith-wcwtl.php(494): YIT_Upgrade->register('yith-woocommerc...', 'yith-woocommerc...') #8 /home/valigeria/public_html/wp-includes/class-wp-hook.php(324): YITH_WCWTL->register_plugin_for_updates('') #9 /home/valigeria/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #10 /home/valigeria/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #11 /home/valigeria/public_html/wp-settings.php(717): do_action('wp_loaded') #12 /home/valigeria/public_html/wp-config.php(110): require_once('/home/valigeria...') #13 /home/valigeria/public_html/wp-load.php(50): require_once('/home/valigeria...') #14 /home/valigeria/public_html/wp-blog-header.php(13): require_once('/home/valigeria...') #15 /home/valigeria/public_html/index.php(17): require('/home/valigeria...') #16 {main} thrown in /home/valigeria/public_html/wp-content/plugins/yith-woocommerce-coupon-email-system-premium/plugin-upgrade/includes/loader.php on line 71