fatal error

Hello,

I have purchased the Premium plugin S2W for migrating from Shopify to WordPress.
When I try to activate the plugin, I get the following fatal error message on WordPress.
Can you please help ?

Fatal error: Uncaught Error: Undefined constant “S2W_Error_Images_Table” in /home/1099433.cloudwaysapps.com/qsamuvjwkr/public_html/wp-content/plugins/s2w-import-shopify-to-woocommerce/s2w-import-shopify-to-woocommerce.php:155 Stack trace: #0 /home/1099433.cloudwaysapps.com/qsamuvjwkr/public_html/wp-includes/class-wp-hook.php(310): S2W_IMPORT_SHOPIFY_TO_WOOCOMMERCE::register_activation_hook() #1 /home/1099433.cloudwaysapps.com/qsamuvjwkr/public_html/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters() #2 /home/1099433.cloudwaysapps.com/qsamuvjwkr/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #3 /home/1099433.cloudwaysapps.com/qsamuvjwkr/public_html/wp-admin/plugins.php(194): do_action() #4 {main} thrown in /home/1099433.cloudwaysapps.com/qsamuvjwkr/public_html/wp-content/plugins/s2w-import-shopify-to-woocommerce/s2w-import-shopify-to-woocommerce.php on line 155