Fatal error: Uncaught exception Exception with message Could not connect to the FTP server thrown in system/modules/core/library/Contao/Files/Ftp.php on line 88

#0 system/modules/core/library/Contao/Files/Ftp.php(155): Contao\Files\Ftp->connect()
#1 system/modules/core/library/Contao/File.php(700): Contao\Files\Ftp->fopen('system/tmp/42ce...', 'wb')
#2 system/modules/core/library/Contao/File.php(375): Contao\File->fputs('', 'wb')
#3 system/modules/core/library/Contao/File.php(362): Contao\File->write('')
#4 system/modules/core/library/Contao/Automator.php(368): Contao\File->truncate()
#5 cron.php(82): Contao\Automator->generateSitemap()
#6 cron.php(133): CronJob->run()
#7 {main}