Hi @jasonxpan,
Can you reset the permissions on the whole htdocs folder?
sudo chown -R bitnami:daemon /opt/bitnami/apps/wordpress/htdocs
sudo find /opt/bitnami/apps/wordpress/htdocs -type d -exec chmod 775 {} \;
sudo find /opt/bitnami/apps/wordpress/htdocs -type f -exec chmod 664 {} \;
sudo chmod 640 /opt/bitnami/apps/wordpress/htdocs/wp-config.php
And restart Apache?
sudo /opt/bitnami/ctlscript.sh restart apache
Regards,
Michiel