Plugin can not be activated

I can download and install the plugin. Both by the wordpress site, when directly by the administrative page of my site. However, it does not accept activation. What can this be?

below the error message

1 – Uncaught Error: Call to undefined function curl_init() in /var/www/html/wp-content/plugins/smart-marketing-for-wp/includes/class-egoi-for-wp-activator.php:69 Stack trace: #0 /var/www/html/wp-content/plugins/smart-marketing-for-wp/includes/class-egoi-for-wp-activator.php(56): Egoi_For_Wp_Activator::_postContent(‘https://plugins-…’, Array) #1 /var/www/html/wp-content/plugins/smart-marketing-for-wp/includes/class-egoi-for-wp-activator.php(36): Egoi_For_Wp_Activator::serviceActivate(Array) #2 /var/www/html/wp-content/plugins/smart-marketing-for-wp/egoi-for-wp.php(42): Egoi_For_Wp_Activator::activate() #3 /var/www/html/wp-includes/class-wp-hook.php(286): activate_egoi_for_wp(”) #4 /var/www/html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array) #5 /var/www/html/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #6 /var/www/html/wp-admin/plugins.php(180): do_action(‘activate_smart-…’) #7 {main} thrown – /var/www/html/wp-content/plugins/smart-marketing-for-wp/includes/class-egoi-for-wp-activator.php – 69