Thanks to @the_hobbes and @Charles, I realized that the file Activate.php was not incorporated. By adding require_once plugin_dir_path( __FILE__ ) . 'inc/Base/Activate.php'; to my code as shown below, it works correctly:
function activate_adstoolbox_plugin() {
require_once plugin_dir_path( __FILE__ ) . 'inc/Base/Activate.php';
Inc\Base\Activate::activate();
}
register_activation_hook( __FILE__, 'activate_adstoolbox_plugin' );
Oops! Newbie’s error …
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