PHP error in wp-content/plugins/wpforo/wpf-includes/class-notices.php on line 16
I get following php error related to wpforo
[1545466547 ] PHP Notice: session_start(): ps_files_cleanup_dir: opendir(/var/lib/php/session) failed: Permission denied (13) in /var/www/vhosts/101/292674/webspace/siteapps/WordPress-515402/htdocs/wp-content/plugins/wpforo/wpf-includes/class-notices.php on line 16
This is not an error but a Notice, still a serious one. And doesn't come directly from wpForo but probably from some error of your tmp (where sessions are stored ?) files directory.
In any case this is a Hosting plan setup or server setup error, for all your Wordpress installation.
Many thanks, I will contact my service provider