While updating with advanced update package using FTP file transfer, PHP throws fatal error:

Uncaught Error: Call to undefined method ftp::transfer() in /forum/includes/functions_transfer.php:284

Stack trace:

#0 /forum/phpbb/install/helper/file_updater/ftp_file_updater.php(72): ftp->__construct('', ', '', 21, 10)

#1 /forum/phpbb/install/module/update_filesystem/task/update_files.php(264): phpbb\install\helper\file_updater\ftp_file_updater->init('ftp', '', , '', 21, 10)

#2 /forum/phpbb/install/module/update_filesystem/task/update_files.php(129): phpbb\install\module\update_filesystem\task\update_files->get_file_updater()

#3 /forum/phpbb/install/module_base.php(149): phpbb\install\module\update_filesystem\task\update_files->run()

#4 //forum/phpbb/install/installer.php(219): phpbb\install\module_base->run()

#5 //public_html/forum/phpbb/install/controller/update.php(133): phpbb\install\installer->run()

#6 /forum/vendor/symfony/http-foundation/StreamedResponse.php(114): phpbb\install\controller\update->phpbb\install\controller

Unknown macro: {closure}

()

#7 /public_html/forum/vendor/symfony/http-foundation/Response.php(374): Symfony\Component\HttpFoundation\StreamedResponse->sendContent()

#8 /forum/install/app.php(62): Symfony\Component\HttpFoundation\Response->send()

#9 {main}

thrown in /forum/includes/functions_transfer.php on line 284