Warning: set_exception_handler() expects the argument (WCF::handleException) to be a valid callback in /var/www/vhosts/wbb-support24.de/httpdocs/wcf/lib/core.functions.php on line 10

Fatal error: Uncaught exception 'SystemException' with message 'PHP warning in file /var/www/vhosts/wbb-support24.de/httpdocs/wcf/lib/util/HeaderUtil.class.php (98): Cannot modify header information - headers already sent by (output started at /var/www/vhosts/wbb-support24.de/httpdocs/wcf/lib/core.functions.php:10)' in /var/www/vhosts/wbb-support24.de/httpdocs/wcf/lib/system/WCF.class.php:281 Stack trace: #0 [internal function]: WCF::handleError(2, 'Cannot modify h...', '/var/www/vhosts...', 98, Array) #1 /var/www/vhosts/wbb-support24.de/httpdocs/wcf/lib/util/HeaderUtil.class.php(98): header('Location: https...') #2 /var/www/vhosts/wbb-support24.de/httpdocs/lib/page/ThreadPage.class.php(320): HeaderUtil::redirect('index.php?page=...', true, true) #3 /var/www/vhosts/wbb-support24.de/httpdocs/lib/page/ThreadPage.class.php(340): ThreadPage->goToLastPost() #4 /var/www/vhosts/wbb-support24.de/httpdocs/lib/page/ThreadPage.class.php(112): ThreadPage->goToFirstNewPost() #5 /var/www/vhosts/wbb-support24.de/httpdocs/wcf/lib/page/Ab in /var/www/vhosts/wbb-support24.de/httpdocs/wcf/lib/system/WCF.class.php on line 281