Wordpress Error PHP Header Error

Hey guys this is my issue

Header
information - headers already sent by (output started at
/home/User/public_html/wp-content/themes/axxum/inc/elements/cms_carousel.php:301) in
/home/User/public_html/wp-admin/includes/misc.php on line
1114

function
            wp_admin_headers() {
 $policy = 'same-origin';


            /**
 * Filters the admin referrer policy header value. Default
            'same-origin'.
 *
 * @since 4.9.0

 * @link
            https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy

            *
 * @param string $policy The referrer policy header value.

            */
 $policy = apply_filters( 'admin_referrer_policy', $policy
            );

 header( sprintf( 'Referrer-Policy: %s', $policy )
            );
}