não consigo fazer login

oi

fiz a instalação do wordpress em meu servidor, mas quando tento fazer login, aparece esta mensagem de erro:

Warning: Cannot modify header information - headers already sent by (output started at /home/domains/apoema.art.br/web/wp-config.php:1) in /home/domains/apoema.art.br/web/wp-login.php on line 354

Warning: Cannot modify header information - headers already sent by (output started at /home/domains/apoema.art.br/web/wp-config.php:1) in /home/domains/apoema.art.br/web/wp-login.php on line 366

ao tentar fazer o login propriamente dito, tenho estas outras mensagens e não consigo mais nada:

Warning: Cannot modify header information - headers already sent by (output started at /home/domains/apoema.art.br/web/wp-config.php:1) in /home/domains/apoema.art.br/web/wp-login.php on line 354

Warning: Cannot modify header information - headers already sent by (output started at /home/domains/apoema.art.br/web/wp-config.php:1) in /home/domains/apoema.art.br/web/wp-login.php on line 366

Warning: Cannot modify header information - headers already sent by (output started at /home/domains/apoema.art.br/web/wp-config.php:1) in /home/domains/apoema.art.br/web/wp-includes/pluggable.php on line 702

Warning: Cannot modify header information - headers already sent by (output started at /home/domains/apoema.art.br/web/wp-config.php:1) in /home/domains/apoema.art.br/web/wp-includes/pluggable.php on line 703

Warning: Cannot modify header information - headers already sent by (output started at /home/domains/apoema.art.br/web/wp-config.php:1) in /home/domains/apoema.art.br/web/wp-includes/pluggable.php on line 704

Warning: Cannot modify header information - headers already sent by (output started at /home/domains/apoema.art.br/web/wp-config.php:1) in /home/domains/apoema.art.br/web/wp-includes/pluggable.php on line 897

Já tentei reinstalar o wordpress algumas vezes, mas nada funciona.

Agradeço pela ajuda.

Abraços, Keu