I saw that someone else had these errors but no solution was posted except that it was necessary to add folders somewhere.
Warning: fopen("TEMPFILE_200299135221_23266", "w") - Permission denied in /home/showngom/public_html/catalog/includes/linkpoint/lpphp.php3 on line 131
Warning: Cannot add header information - headers already sent by (output started at /home/showngom/public_html/catalog/includes/linkpoint/lpphp.php3:131) in /home/showngom/public_html/catalog/includes/functions/general.php on line 23