ciao a tutti

sto creando un sito con WORDPRESS

chiedo il vs. aiuto in quanto nell'interfaccia relativa al login vedo visualizzato i seguenti errori

"Warning: Cannot modify header information - headers already sent by (output started at /var/www/wordpress/wp-content/themes/wp-multiflex-3-italiano/functions.php:1) in /var/www/wordpress/wp-login.php on line 337

Warning: Cannot modify header information - headers already sent by (output started at /var/www/wordpress/wp-content/themes/wp-multiflex-3-italiano/functions.php:1) in /var/www/wordpress/wp-login.php on line 349"

se effettuo il login visualizzo i seguenti errori:
"
Warning: Cannot modify header information - headers already sent by (output started at /var/www/wordpress/wp-content/themes/wp-multiflex-3-italiano/functions.php:1) in /var/www/wordpress/wp-login.php on line 337

Warning: Cannot modify header information - headers already sent by (output started at /var/www/wordpress/wp-content/themes/wp-multiflex-3-italiano/functions.php:1) in /var/www/wordpress/wp-login.php on line 349

Warning: Cannot modify header information - headers already sent by (output started at /var/www/wordpress/wp-content/themes/wp-multiflex-3-italiano/functions.php:1) in /var/www/wordpress/wp-includes/pluggable.php on line 690

Warning: Cannot modify header information - headers already sent by (output started at /var/www/wordpress/wp-content/themes/wp-multiflex-3-italiano/functions.php:1) in /var/www/wordpress/wp-includes/pluggable.php on line 691

Warning: Cannot modify header information - headers already sent by (output started at /var/www/wordpress/wp-content/themes/wp-multiflex-3-italiano/functions.php:1) in /var/www/wordpress/wp-includes/pluggable.php on line 692

Warning: Cannot modify header information - headers already sent by (output started at /var/www/wordpress/wp-content/themes/wp-multiflex-3-italiano/functions.php:1) in /var/www/wordpress/wp-includes/pluggable.php on line 890"

cosa devo fare per eliminare gli errori sopra citati?

grazie