After update Motion theme, errors with header

Hi! I updated WordPress up to newest version, then updated motion theme and now in every page I got error “Warning: Cannot modify header information – headers already sent by (output started at /home/skridas/domains/x/public_html/wp-content/themes/motion/functions.php:1) in /home/skridas/domains/x/public_html/wp-includes/pluggable.php on line 890”. How I can edit Motion file “functions.php”?