MY-ERROR: Cannot assign requested address

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#0 /home/ticeatpv/www.ticket-regional.de/inc/class_db.php(87): mysqli_connect()
#1 /home/ticeatpv/www.ticket-regional.de/inc/class_db.php(407): DBTheatre->connect()
#2 /home/ticeatpv/www.ticket-regional.de/inc/config.php(1411): DBSubTheatre->query()
#3 /home/ticeatpv/www.ticket-regional.de/index.php(1): require_once('...')
#4 {main}