MainWP Child (4.4.0.4) and PHP 8.1 not work!

error: [Fri Mar 31 21:18:48.773632 2023] [php:error] [pid 30562] [client 99.99.99.99:0] PHP Fatal error: Uncaught TypeError: ftp_nlist(): Argument #1 ($ftp) must be of type FTP\Connection, null given in /home/site.com/www/wp-admin/includes/class-wp-filesystem-ftpext.php:427\nStack trace:\n#0 /home/site.com/www/wp-admin/includes/class-wp-filesystem-ftpext.php(427): ftp_nlist()\n#1 /home/site.com/www/wp-admin/includes/class-wp-filesystem-base.php(229): WP_Filesystem_FTPext->exists()\n#2 /home/site.com/www/wp-admin/includes/class-wp-filesystem-base.php(58): WP_Filesystem_Base->find_folder()\n#3 /home/site.com/www/wp-content/plugins/mainwp-child/class/class-mainwp-security.php(339): WP_Filesystem_Base->abspath()\n#4 /home/site.com/www/wp-content/plugins/mainwp-child/class/class-mainwp-security.php(50): MainWP\Child\MainWP_Security::remove_readme()\n#5 /home/site.com/www/wp-content/plugins/mainwp-child/class/class-mainwp-child.php(297): MainWP\Child\MainWP_Security::fix_all()\n#6 /home/site.com/www/wp-includes/class-wp-hook.php(308): MainWP\Child\MainWP_Child->parse_init()\n#7 /home/site.com/www/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()\n#8 /home/site.com/www/wp-includes/plugin.php(517): WP_Hook->do_action()\n#9 /home/site.com/www/wp-settings.php(623): do_action()\n#10 /home/site.com/www/wp-config.php(99): require_once(‘…’)\n#11 /home/site.com/www/wp-load.php(50): require_once(‘…’)\n#12 /home/site.com/www/wp-blog-header.php(13): require_once(‘…’)\n#13 /home/site.com/www/index.php(17): require(‘…’)\n#14 {main}\n thrown in /home/site.com/www/wp-admin/includes/class-wp-filesystem-ftpext.php on line 427