Fatal error: Uncaught TypeError: ftp_nlist(): Argument #1 ($ftp) must be of type FTP\Connection, null given in /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php:438 Stack trace: #0 /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php(438): ftp_nlist(NULL, '/var/www/html/w...') #1 /var/www/html/wp-content/plugins/advanced-gutenberg/install.php(142): WP_Filesystem_FTPext->exists('/var/www/html/w...') #2 /var/www/html/wp-content/plugins/advanced-gutenberg/advanced-gutenberg.php(90): require_once('/var/www/html/w...') #3 /var/www/html/wp-settings.php(545): include_once('/var/www/html/w...') #4 /var/www/html/wp-config.php(90): require_once('/var/www/html/w...') #5 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...') #6 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...') #7 /var/www/html/index.php(17): require('/var/www/html/w...') #8 {main} thrown in /var/www/html/wp-admin/includes/class-wp-filesystem-ftpext.php on line 438