Portal - eigene Boxen löschen

Information:
error message: PHP error in file /var/www/vhosts/xxx.de/httpdocs/Forum/lib/data/boxes/CustomBoxEditor.class.php (0): Declaration of CustomBoxEditor::create() should be compatible with PortalBoxEditor::create($boxName, $boxType, $className, $useCache = 0, $cacheType = '', $cacheBuilderClass = '', $sortOrder = 0, $boxActivation = 1, $minLifeTime = 0, $maxLifeTime = 0, $showInForum = 0, $permissions = '', $options = '', $packageID = 48, $additionalFields = Array)
error code: 0
file: /var/www/vhosts/xxx.de/httpdocs/Forum/wcf/lib/system/WCF.class.php (281)
php version: 5.5.9-1ubuntu4.14
wcf version: 1.1.10 pl 2 (Tempest)
date: Mon, 11 Jan 2016 05:32:55 +0000
request: /acp/index.php?action=CustomBoxDelete&boxID=17&packageID=48&
referer: http://xxx/acp/index.php?page=CustomBoxList&packageID=48&
Stacktrace:
#0 /var/www/vhosts/xxx.de/httpdocs/Forum/lib/acp/action/CustomBoxDeleteAction.class.php(4): WCF::handleError(2048, 'Declaration of ...', '/var/www/vhosts...', 0, Array)
#1 /var/www/vhosts/xxx.de/httpdocs/Forum/lib/acp/action/CustomBoxDeleteAction.class.php(4): require_once()
#2 /var/www/vhosts/xxx.de/httpdocs/Forum/wcf/lib/util/RequestHandler.class.php(58): require_once('/var/www/vhosts...')
#3 /var/www/vhosts/xxx.de/httpdocs/Forum/wcf/lib/util/RequestHandler.class.php(98): RequestHandler->__construct('CustomBoxDelete', Array, 'action')
#4 /var/www/vhosts/xxx.de/httpdocs/Forum/acp/index.php(8): RequestHandler::handle(Array)
#5 {main}