Fatal error: Unable to load cache resource 'cronjobs-24'

Information:

error message: Unable to load cache resource 'cronjobs-24'
error code: 0
file: /var/www/vhosts/h466744.server54.campusspeicher.de/httpdocs/board/wcf/lib/system/cache/CacheHandler.class.php (214)
php version: 5.6.40
wcf version: 1.0.11 pl 3 (Horizon)
date: Thu, 18 Jul 2024 14:30:59 +0000
request: /board/index.php?item=usercp&page=Help&s=1da11ccb2f0ae7149264a8179c795b172ecb0785
referer:

Stacktrace:

#0 /var/www/vhosts/h466744.server54.campusspeicher.de/httpdocs/board/wcf/lib/system/cache/CacheHandler.class.php(196): CacheHandler->loadCacheFile(Array)
#1 /var/www/vhosts/h466744.server54.campusspeicher.de/httpdocs/board/wcf/lib/system/cache/CacheHandler.class.php(155): CacheHandler->load(Array)
#2 /var/www/vhosts/h466744.server54.campusspeicher.de/httpdocs/board/lib/system/WBBCore.class.php(53): CacheHandler->get('cronjobs-24', 'nextExec')
#3 /var/www/vhosts/h466744.server54.campusspeicher.de/httpdocs/board/lib/system/WBBCore.class.php(40): WBBCore->initCronjobs()
#4 /var/www/vhosts/h466744.server54.campusspeicher.de/httpdocs/board/wcf/lib/system/WCF.class.php(93): WBBCore->initTPL()
#5 /var/www/vhosts/h466744.server54.campusspeicher.de/httpdocs/board/global.php(18): WCF->__construct()
#6 /var/www/vhosts/h466744.server54.campusspeicher.de/httpdocs/board/index.php(7): require_once('/var/www/vhosts...')
#7 {main}