Plugin could not be activated because it triggered a fatal error.

Fatal error: Uncaught Error: Class ‘VIWEC\INCLUDES\Email_Samples’ not found in /var/www/sites/730/public_html/wp-content/plugins/woocommerce-email-template-customizer/woocommerce-email-template-customizer.php:110 Stack trace: #0 /var/www/sites/730/public_html/wp-includes/class-wp-hook.php(303): WooCommerce_Email_Template_Customizer->viwec_activate() #1 /var/www/sites/730/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters() #2 /var/www/sites/730/public_html/wp-includes/plugin.php(470): WP_Hook->do_action() #3 /var/www/sites/730/public_html/wp-admin/plugins.php(193): do_action() #4 {main} thrown in /var/www/sites/730/public_html/wp-content/plugins/woocommerce-email-template-customizer/woocommerce-email-template-customizer.php on line 110