[18-Aug-2024 23:41:04 UTC] PHP Fatal error:  Uncaught TypeError: fwrite(): Argument #1 ($stream) must be of type resource, bool given in /srv/htdocs/wp-content/themes/acabado-1/functions.php:1882

Stack trace:
#0 /srv/htdocs/wp-content/themes/acabado-1/functions.php(1882): fwrite(false, '<?xml version="...')
#1 /wordpress/core/6.6.1/wp-includes/class-wp-hook.php(324): income_school_create_image_sitemap()
#2 /wordpress/core/6.6.1/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#3 /wordpress/core/6.6.1/wp-includes/plugin.php(565): WP_Hook->do_action(Array)
#4 /wordpress/core/6.6.1/wp-cron.php(191): do_action_ref_array('aca_sitemap_gen...', Array)
#5 {main}
  thrown in /srv/htdocs/wp-content/themes/acabado-1/functions.php on line 1882