Login nicht nöglich

habe new WP installiert, kann auf meienr seite (ww.dreamway.ch) nicht einloggen Benutzername und PW stimmt. Bekomme die nachstehende fehlermeldung. Was muss ich machen um als Admin einloggen zu können und meine Beiträge zu Posten?
Danke für eure Hilfe.

Warning: Cannot modify header information – headers already sent by (output started at /var/www/dreamway/wp-config.php:2) in /var/www/dreamway/wp-login.php on line 384

Warning: Cannot modify header information – headers already sent by (output started at /var/www/dreamway/wp-config.php:2) in /var/www/dreamway/wp-login.php on line 396

Warning: Cannot modify header information – headers already sent by (output started at /var/www/dreamway/wp-config.php:2) in /var/www/dreamway/wp-includes/pluggable.php on line 678

Warning: Cannot modify header information – headers already sent by (output started at /var/www/dreamway/wp-config.php:2) in /var/www/dreamway/wp-includes/pluggable.php on line 679

Warning: Cannot modify header information – headers already sent by (output started at /var/www/dreamway/wp-config.php:2) in /var/www/dreamway/wp-includes/pluggable.php on line 680

Warning: Cannot modify header information – headers already sent by (output started at /var/www/dreamway/wp-config.php:2) in /var/www/dreamway/wp-includes/pluggable.php on line 875