Problem: Cannot modify header information

Hello, i have this problem in my new theme
when i login in wp dashboard i get this message

———————————————–
Warning: Invalid argument supplied for foreach() in /home/sitemysql/public_html/wordpress/wp-content/themes/listings/includes/theme-functions.php on line 2373

Warning: Cannot modify header information – headers already sent by (output started at /home/sitemysql/public_html/wordpress/wp-config.php:1) in /home/sala7/public_html/wordpress/wp-includes/functions.php on line 861

Warning: Cannot modify header information – headers already sent by (output started at /home/sitemysql/public_html/wordpress/wp-config.php:1) in /home/sitemysql/public_html/wordpress/wp-includes/functions.php on line 862

Warning: Invalid argument supplied for foreach() in /home/sitemysql/public_html/wordpress/wp-content/themes/listings/includes/theme-options.php on line 103
———————————————–

and in the blog homepage i get this message

———————————————–
Warning: Invalid argument supplied for foreach() in /home/sitemysql/public_html/wordpress/wp-content/themes/listings/includes/theme-functions.php on line 2373
———————————————–

i try all ways to fix it and i can’t, please help
thanks and sorry for my english