Fatal error: Unable to load cache resource 'cronjobs-38'

Information:

error message: Unable to load cache resource 'cronjobs-38'
error code: 0
file: /www/htdocs/checkar/board/wcf/lib/system/cache/CacheHandler.class.php (214)
php version: 5.6.40-nmm8
wcf version: 1.0.11 pl 4 (Horizon)
date: Mon, 10 Jun 2024 14:48:31 +0000
request: /board/index.php?letter=V&page=MembersList&s=e2d072877b3dccb72dd596f2aeef2b27cbf7f04d&searchID=0
referer:

Stacktrace:

#0 /www/htdocs/checkar/board/wcf/lib/system/cache/CacheHandler.class.php(196): CacheHandler->loadCacheFile(Array)
#1 /www/htdocs/checkar/board/wcf/lib/system/cache/CacheHandler.class.php(155): CacheHandler->load(Array)
#2 /www/htdocs/checkar/board/lib/system/WBBCore.class.php(73): CacheHandler->get('cronjobs-38', 'nextExec')
#3 /www/htdocs/checkar/board/lib/system/WBBCore.class.php(38): WBBCore->initCronjobs()
#4 /www/htdocs/checkar/board/wcf/lib/system/WCF.class.php(93): WBBCore->initTPL()
#5 /www/htdocs/checkar/board/global.php(18): WCF->__construct()
#6 /www/htdocs/checkar/board/index.php(7): require_once('/www/htdocs/che...')
#7 {main}