WCF::handleException() Unhandled exception: PHP error in file /var/www/vhosts/quadcrew-westerwald.de/httpdocs/wcf/lib/util/StringUtil.class.php (485): Array and string offset access syntax with curly braces is deprecated

#0 /var/www/vhosts/quadcrew-westerwald.de/httpdocs/wcf/lib/system/WCF.class.php(647): wcf\system\WCF::handleError()
#1 /var/www/vhosts/quadcrew-westerwald.de/httpdocs/wcf/lib/system/WCF.class.php(647): require_once()
#2 [internal function]: wcf\system\WCF::autoload()
#3 /var/www/vhosts/quadcrew-westerwald.de/httpdocs/wcf/lib/system/database/DatabaseException.class.php(136): spl_autoload_call()
#4 /var/www/vhosts/quadcrew-westerwald.de/httpdocs/wcf/lib/system/WCF.class.php(276): wcf\system\database\DatabaseException->show()
#5 [internal function]: wcf\system\WCF::handleException()
#6 {main}