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

Information:

error message: Unable to load cache resource 'cronjobs-24'
error code: 0
file: /mnt/web009/a2/58/51468458/htdocs/suedstrasse/wcf/lib/system/cache/CacheHandler.class.php (214)
php version: 5.6.30
wcf version: 1.0.11 pl 3 (Horizon)
date: Tue, 30 May 2017 03:53:38 +0000
request: /
referer:

Stacktrace:

#0 /mnt/web009/a2/58/51468458/htdocs/suedstrasse/wcf/lib/system/cache/CacheHandler.class.php(196): CacheHandler->loadCacheFile(Array)
#1 /mnt/web009/a2/58/51468458/htdocs/suedstrasse/wcf/lib/system/cache/CacheHandler.class.php(155): CacheHandler->load(Array)
#2 /mnt/web009/a2/58/51468458/htdocs/suedstrasse/lib/system/WBBCore.class.php(47): CacheHandler->get('cronjobs-24', 'nextExec')
#3 /mnt/web009/a2/58/51468458/htdocs/suedstrasse/lib/system/WBBCore.class.php(34): WBBCore->initCronjobs()
#4 /mnt/web009/a2/58/51468458/htdocs/suedstrasse/wcf/lib/system/WCF.class.php(93): WBBCore->initTPL()
#5 /mnt/web009/a2/58/51468458/htdocs/suedstrasse/global.php(18): WCF->__construct()
#6 /mnt/web009/a2/58/51468458/htdocs/suedstrasse/index.php(7): require_once('/mnt/web009/a2/...')
#7 {main}