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Hi again, I tried to sent you the files but the host suspended my account because the site keep sending request

I turned  WP_DEBUG to true and I found some errors

Warning: Cannot modify header information – headers already sent by (output started at /home/truechea/public_html/wp-includes/class-wp-post.php:1) in /home/truechea/public_html/wp-includes/pluggable.php on line 1179

Warning: Cannot modify header information – headers already sent by (output started at /home/truechea/public_html/wp-includes/class-wp-post.php:1) in /home/truechea/public_html/wp-login.php on line 398Warning: Cannot modify header information – headers already sent by (output started at /home/truechea/public_html/wp-includes/class-wp-post.php:1) in /home/truechea/public_html/wp-login.php on line 411Warning: Cannot modify header information – headers already sent by (output started at /home/truechea/public_html/wp-includes/class-wp-post.php:1) in /home/truechea/public_html/wp-includes/pluggable.php on line 893Warning: Cannot modify header information – headers already sent by (output started at /home/truechea/public_html/wp-includes/class-wp-post.php:1) in /home/truechea/public_html/wp-includes/pluggable.php on line 894Warning: Cannot modify header information – headers already sent by (output started at /home/truechea/public_html/wp-includes/class-wp-post.php:1) in /home/truechea/public_html/wp-includes/pluggable.php on line 895Warning: Cannot modify header information – headers already sent by (output started at /home/truechea/public_html/wp-includes/class-wp-post.php:1) in /home/truechea/public_html/wp-includes/pluggable.php on line 1179

How I can fix them ?