Error in the Header

Hello! I've just bought your new theme My Music Band Pro and there is such an error in Console: Warning: Cannot modify header information - headers already sent by (output started at /home/che/melnitsa.info/docs/wp-content/themes/my-music-band-pro/inc/custom-header.php:1) in /home/che/melnitsa.info/docs/wp-admin/includes/misc.php on line 1124 How should I solve this problem? Thank you in advance!