Balafononlus

Thank you very much for your help, I don’t manage to login when I put my usermaname and password i receive this message :
Warning: Cannot modify header information – headers already sent by (output started at /home/bantousb/public_html/wp-content/themes/fragrance/functions.php:20) in /home/bantousb/public_html/wp-login.php on line 418

Warning: Cannot modify header information – headers already sent by (output started at /home/bantousb/public_html/wp-content/themes/fragrance/functions.php:20) in /home/bantousb/public_html/wp-login.php on line 431

Please I have this problem when I login

Warning: Cannot modify header information – headers already sent by (output started at /home/bantousb/public_html/wp-content/themes/fragrance/functions.php:20) in /home/bantousb/public_html/wp-includes/pluggable.php on line 1179
can you help me please
thank you very much