Error http 500 “admin-ajax.php”

I’m having the error below displayed in the Chrome console every time I try to run a particular plugin.
His name is YITH Watermark.
The 500 error occurs exactly when I click the button to generate the tags.
By analyzing the PHP 7.2 logs, I have this information below. Could anyone say what it could be? Thank you.

[19-Oct-2018 01:00:03 UTC] PHP Fatal error: Uncaught Error: Call to undefined function imagecreatefrom() in /srv/users/worldcenter/apps/worldcenter/public/wp-content/plugins/yith-woocommerce-watermark-premium/includes/classes/class.yith-woocommerce-watermark.php:749
Stack trace:

0 /srv/users/worldcenter/apps/worldcenter/public/wp-includes/class-wp-hook.php(286): YITH_WC_Watermark->build_watermark_image(Resource id #146, Array)

1 /srv/users/worldcenter/apps/worldcenter/public/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array)

2 /srv/users/worldcenter/apps/worldcenter/public/wp-includes/plugin.php(453): WP_Hook->do_action(Array)

3 /srv/users/worldcenter/apps/worldcenter/public/wp-content/plugins/yith-woocommerce-watermark-premium/includes/classes/class.yith-woocommerce-watermark.php(685): do_action(‘ywcwat_build_wa…’, Resource id #146, Array)

4 /srv/users/worldcenter/apps/worldcenter/public/wp-content/plugins/yith-woocommerce-watermark-premium/includes/classes/class.yith-woocommerce-watermark.php(440): YITH_WC_Watermark->save_im in /srv/users/worldcenter/apps/worldcenter/public/wp-content/plugins/yith-woocommerce-watermark-premium/includes/classes/class.yith-woocommerce-watermark.php on line 749

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